Statistically, JDM has been trying to get his stroke back for all of August and September, during which his OPS has been under .800. Plus there is no right handed pitcher on this planet who does not know that JDM cannot hit a slider away.
Meanwhile, with just 10 games to play, including this one, you want to keep inserting JDM against righties even though Dalbec is hitting better. Plus tonight, to keep lefty bat Verdugo in LF and allow JDM to DH, you want Schwarber at 1b, the very position where he--last time he played there--mishandled an easy grounder that cost the Sox the game.
I do not doubt that Cora has his reasons for playing JDM, but right now I like mine better. Feel free to gloat when JDM wins the game tonight.