On the other hand, there may be a bullpen crunch.
Kimbrel, Kelly, and Barnes have spots. Barring injuries, one of the six starters (Wright?) takes a fourth. If the Sox add two relievers - and other than a DH, what else will they add? - that leaves one bullpen slot for Abad, Ross, Elias and Hembree. None can be demoted without clearing waivers.
Even if the Sox only add one reliever, that probably means Abad and Ross grab the last two spots. Elias' chances of making the Sox might be too dependent on the health of everyone else. Ditto Hembree...