I think it's reasonable the Sox can get improved offense at LF, 3B, SS and even 1B if Hanley is in the ballpark of his 2nd half all year long.
I think it's also reasonable that JBJ takes a step back, and Pedey is more like 2014-15 Pedey (mostly from getting banged up and being another year older).
It's tough to conceive of Mookie getting better than his MVP caliber year, but he is in theory, just entering his prime. I think catching will stay about the same. Ryan Hanigan was the worst hitter on earth last year which partially offset Leon's insanity, and Swihart could get some AB's in there.
There is, of course, no chance of DH improving.
It's still a pretty great offense, and if X takes another step forward and Pablo approaches his Giants form, it's elite. Plus, a full year of Beni on the bases combined with what they had last year, is also a good thing.