Realistically, the Sox need all three of Bregman, Alonso and Schwarber, if they want to stack up against the elite batting orders of true contenders. They're not going to the playoffs because of their gloves, like the NL's top four teams in defensive efficiency did: Cubs, Padres, Red, Brewers.
The other two NL favorites, LA and Philly, are so loaded they can compensate for other weaknesses. When one stud has a bad game or slumps, there are always other stars due up who can change the game with one swing.
Having a deep line-up with several longball threats is vital in the postseason, so foes can't always pitch around danger. Boston lost Anthony, but the Blue Jays also played without their best hitter in Bichette -- and still blasted 9 home runs in 4 games vs. NY.