FanGraphs has a good article on the Sox's woes today.
https://blogs.fangraphs.com/crochets-struggles-are-just-the-start-of-bostons-problems/
Some highlights:
Crochet’s average four-seam fastball velocity is down 0.5 mph, and he’s reduced his use of the pitch in favor of his sinker. But even more noticeable is his change in arm angle, which was as high as 56 degrees in 2021, when he was a full-time reliever. It’s dropped from an average of 35 degrees last year to 31, and while it’s cost him less than an inch of movement in any plane with regards to any of his offerings, I wonder if it’s cost him deception as well. Our two pitch modeling systems see declines in both his stuff and command/location...
This is Gray’s fourth trip to the IL since the start of 2022 due to a right hamstring strain. Fortunately in the other three (two in 2022, one in ’24), he averaged just 17 days on the sidelines, and this sounds similar. “I threw that last 3-2 pitch, and I felt a grab in my right hamstring,” Gray said afterwards. “It’s something that I have felt before. In the moment, I kind of knew what it was. I knew I needed to at least throw a warm-up pitch before I felt comfortable continuing.”
In games where their starter has pitched at least six innings, the Red Sox are 8-0, but in anything shorter, they’re now 1-15, with Gray’s abbreviated start the only one they’ve won. League-wide, teams are 168-79 (a .680 winning percentage) when a starter goes six, and 200-289 (.409) when falling short.
The short starts have taxed a bullpen that was supposed to be among the best... but has instead been rather shaky. Closer Aroldis Chapman and top setup man Garrett Whitlock have been fine, but their other higher-leverage righties, Greg Weissert and Zack Kelly, have scuffled. The unit’s 3.56 ERA ranks a respectable 10th in the majors, but they’re 24th in FIP (4.60) and WAR (-0.1), 25th in home run rate (1.35 per nine), and 24th in xERA (4.60). Regarding that last stat, in very small samples somehow nine of the 13 relievers they’ve used have double-digit barrel rates, with Chapman, Weissert and Whitlock all at 13.6% or above. While they strike out enough hitters to help offset that, not all of Boston’s other relievers do.
For now it will suffice to say that that the team is hitting a combined .226/.310/.333, ranking dead last in the majors in slugging percentage — how does a team playing in Fenway Park even do that? — and 28th in wRC+ (81).
In light of those struggles, chief baseball officer Craig Breslow’s major roster construction decisions — trading Rafael Devers last year, letting Alex Bregman depart as a free agent and replacing him with the much less powerful Durbin, holding onto the glut of outfielders instead of using the surplus to upgrade the lineup elsewhere — don’t look any better. But starting pitching was supposed to be this team’s strength, and instead it’s just another reason the Red Sox are running last.