This makes sense to me because JDM seems to be helping this lineup the same way he helped the 2018 lineup, which was more talented. To date, he has the highest OPS on the Sox and the most runs scored. He is 2d in rbi's, total bases, and WAR.
I also have my doubts about going after a great arm. Getting Eovaldi in 2018 helped, but back then DD had JH's permission to spend almost any amount of money and unload any amount of minor league talent. Your point, with which I agree, is that the Sox have postseason potential, but probably not WS potential, regardless of any trade.
No one has worked so far leading off for the Sox. My candidate would be Arroyo, whose OBP, .333, is 5th best after the usual suspects' (JDM, Bogey, Verdugo, Devers).
As for Santana, despite his hot start, his OPS is now .530 and his OBP .205. Hernandez's OPS is .654 and OBP .277.