I agree with those who can't imagine the Sox switching Devers and Dalbec during the season. Devers is a third baseman, period. He's capable of being solid, and sometimes spectacular. Can we agree his defensive lapses aren't physical, since he has elite reflexes and a strong arm? He just needs maturity, and probably continued guidance from coaches and teammates. If he needs a break, the versatile vets will spell him.
If Rafie is borderline brutal all season, then the Sox may choose to make changes next offseason... just like the Yankees will when they finally admit they can't win with Torres at shortstop (he's no Jeter -- a mostly solid, sometimes overrated defender, with a knack for making clutch plays; Torres just isn't good).