You are correct. As it is apparently for $11 mill, he very likely stays.
If Schwarber comes back to Boston, perhaps some sort of contract swap involving JDM and JBJ can happen. Probably need a third team and a few more parts (BTV has JDM’s value at 0.1, far and away ahead of JBJ’s -16.8.)
Teams that might take the chance on JDM include Texas, KC, Philly (an obvious Dombrowski connection), and possibly Arizona (where JD became some sort of legend in his brief time there)..