The Red Sox's Core Four Era Is Over. Did The 2026 Trade Deadline Give Us A Glimpse Into A Philosophy Shift In Boston?

[Ryan Salvaggio]

As the dust settled and the final reports came in on what the Boston Red Sox were sending back to the Baltimore Orioles in the jaw-dropping Adley Rutschman trade, the belief seemed to be a consensus one, especially among those who closely follow the prospect side of the game: “Wow did the Red Sox overpay in the deal!” 

That belief was justifiable with Boston sending their numbers two, four, and five prospects (Anthony Eyanson, Kyson Witherspoon, and Enddy Azocar) along with big leaguer Carlos Narváez, and a Player To Be Named Later who ended up being Harold Rivas, the Sox's No. 13 prospect. They would of course follow that up later in the day by sending out a former number one prospect in Marcelo Mayer to acquire San Francisco Giants lefty reliever Erik Miller. 

While fans will debate if too much was given up to secure Rutschman, or if the plug was pulled too quickly on Mayer, one question that should without a doubt be on fans minds is this: Did Craig Breslow’s aggressive approach signify a shift in the club’s philosophy to prioritize known commodities rather than banking on prospect potential? If that answer is yes… well then it’s about damn time. 

If you’ve followed the Red Sox since they drafted Mayer fourth overall in 2021, making him the highest pick in franchise history, there’s a phrase ownership has been preaching that looked to be setting up the foundation of the franchise for years to come: ‘The Core Four.’ That phrase of course refers to Boston’s quartet of highly glamorized prospects including Mayer, Kyle Teel, Roman Anthony, and at first Nick Yorke, but later transitioned to Kristian Campbell after Yorke was dealt to Pittsburgh in 2024.   

These four prospects were looked at as nearly untouchable early on, so much so that any trade talks involving Mayer were seemingly shut down, Anthony was granted an eight-year, $130 million extension just 46 games into his big-league career, and the Driveline darling that was Campbell earned an even more egregious eight-year, $60 million extension just eight games in. 

I say "nearly untouchable" because unfortunately for Teel, he was the odd-man out when the Red Sox first bit the bullet on trading prospects; they shipped him along with Braden Montgomery, Chase Meidroth, and Wikelman Gonzalez to the White Sox for Garrett Crochet in the winter of 2024. At the time of the deal, Teel ranked fourth in Boston’s system and 25th in all of baseball (per MLB Pipeline). Montgomery ranked fifth and 54th. Meidroth and Gonzalez were 11th and 14th on the Red Sox's top 30. Surely, another trade that stung at the time for those who prospect watch, but the need of a true ace for the staff was glaring and the addition of Crochet more than filled that hole. 

Fast-forward two years post-trade and barring the injury to Crochet, it doesn’t seem like a deal that either team has lost sleep over. Crochet pitched to a runner-up finish in the 2025 Cy Young voting and dominated in Boston’s only Wild Card series win in the Bronx versus the Yankees. On the White Sox's side, Teel has been a little difficult to evaluate with just 97 games played in a season-plus. He missed 78 games at the start of this season with a hamstring injury and after just 19 games played, found his way back to the IL where he’s been since July 21 with an ankle sprain. All things considered, when he has been out there he has looked like a promising young player, owning a 110 OPS+, 114 wRC+ and a 21.3% caught stealing percentage. Montgomery, meanwhile, has been on the streakier side since his call-up, which featured a walk-off home run in his debut and not much else of note since with just a .230/.317/.372/.689 line. When it comes to Meidroth, he has been the definition of a solid, league-average player, owning a career .263 average, 4.1 WAR, 97 OPS+ and 100 wRC+ through 235 career games. And as for Gonzalez, while he shined in a relief role in 2025 with a 2.66 ERA, .178 average against, and 28.7 strikeout percentage in 16 appearances, elbow and lat injuries have not only cut into the last two seasons, but may have also been the cause of his surprise DFA by Chicago on August 8.

No longer the ‘Core Four’, the focus seemed to shift to who some called the ‘Big Three’ of Mayer, Anthony, and Campbell as the trio that the organization would build around. Ushering in the next golden age of Red Sox baseball, harking back to the memories of other notable young players who became integral pieces of championship clubs like Dustin Pedroia, Jacoby Ellsbury, and Xander Bogaerts. After the trade deadline, however, it may be safe to say that hope of leaning all in on the prospects was a mistake that needed correcting with a philosophy shift more toward known and established commodities. 

At the start, the returns on Campbell and Anthony looked great. Campbell began his 2025 rookie campaign as one of Boston’s best hitters through March/April slashing .301/.407/.495/.902 with a wRC+ of 150. As for Anthony, he was the spark the Sox rode for the 71 games he played last year, hitting .292 with eight homers, 32 RBI, and wRC+ and OPS+’s of 140.

Then, things rapidly fell apart for Campbell, who after that first month plus saw his line drastically fall to .159/.243/.222/.218 with a wRC+ of 30 and strikeout and walk percentages of 28.6% and 7.1%. That earned him a demotion to Worcester, where he has since been buried with no clear shot at a path back to the majors. As for Anthony, injuries have derailed his strong start with 25 games missed last year due to an oblique strain and nearly another 100 and counting missed from a combination of back soreness and a wrist sprain, leading many to question his durability.

In the case of Mayer, there never came that moment where things seemed to fully click, leading some to wonder if he’ll go down as one of, if not the, most-overhyped prospects in Red Sox history. In just 114 games, Mayer accumulated a 0.3 WAR, slashed .223/.278/.346/.625 with seven homers, 32 RBI, a 70 wRC+ and career strikeout and walk rates of 23.4% and 6.6%. Along with his offensive woes, his defensive prowess never really hit its projections either, with negative-3 Defensive Runs Saved and only plus-2 Outs Above Average during his time split across third, short, and second. Then of course, there are the much talked about maturity, work ethic, and durability concerns he faced, as he ended up missing 102 games (playoffs included) due to various injuries over the last two seasons—not to mention the number of minor-league stints he had cut short due to injuries as well.  

Obviously, Red Sox fans will never get the chance to see firsthand if the Eyanson, Witherspoon, Azocar trio lives up to their projected hype, or if they underperform like the last ‘Big Three.' But in a 2026 season where the Sox find themselves in the midst of an epic turnaround and push for a playoff spot, the decision to move their chips into the center of the table and go get a bonafide bat in Rutschman and lockdown southpaw in Miller, as opposed to the waiting-and-seeing approach with Mayer and the kids, has to be looked at as the right one.  

Like Crochet did before in filling the ace vacancy, Rutschman does the same in providing a bat to deepen the Red Sox’s relatively top-heavy lineup. His career 16.8 WAR, 115 OPS+ and wRC+ and 15.8 strikeout and 11.7 walk rates gives the lineup a professional approach at the plate night after night, and his 24.4% caught stealing rate and 38 DRS gives them an elite option behind the plate. Now I might just be crazy, but those numbers sound like they could be pretty beneficial to the here and now rather than waiting to see what Eyanson, Witherspoon or Azocar have to offer in the 2027 and 2028 ETAs that MLB Pipeline has proposed for them.

When it all comes down to it, you’re most likely never going to get the entire fanbase to agree to a consensus on these trades, and that’s okay. It’s more than respectable to be one of the people who wants to build through the draft and produce homegrown talent to try and win that way. It’s also just as respectable to want the organization to not only evaluate the prospects they see as part of the future, but also those who aren’t and act accordingly. Identifying external pieces they believe can help win both now and in the future and jumping at the chance if/when they become available is a part of team-building as well.

That is what Craig Breslow did when he acquired Rutschman and Miller. There's no guarantee that this gambit will pay off, but the team's championship hopes over the next few years improved because of it. That's a philosophy shift worth lauding.

View full article