I'm not sure I agree with "when we all know better." The fact is that the Sox have a pretty fair outfield when Kike is in CF where his DWAR is +2.1. Verdugo's DWAR is -.2 and Renfroe's is -.5 because of all those errors, but he also led MLB with 16 outfield assists.
As for the infield, Bogey, +.3, and Arroyo, +.7 both have positive DWAR's despite Bogey's lack of range. That leaves Devers, -.9, and Schwarber, -.5, both of whom have defended well in the post season. Devers actually has pretty good range at 3b. His problem is primarily throwing errors. The Sox have played 8 postseason games and committed 1 error--Schwarber's awful underhanded toss. Oh, and Vazquez's DWAR is +1.3.