I'm high on Cora too, but agree it's way too early, especially when this particular team is, I believe, the highest paid in MLB this year.
The thing is, things changed after John Henry took over and did two key things: opened up the pocketbook and got good GM's (for the most part). I think there is no question Francona benefited from the John Henry era. So did Farrell for awhile. Those two won three WS after an 86 year lapse, but they had a lot of help.
I don't know Joe Morgan at all, but he sounds pretty darn good.
Cora has basically the same guys as last year except they are healthier and have added JD, and they look like a different team. Maybe he is the best, but we won't know for about six months or several years.