To get to 39 W's, one of Jr. Smith/Elf would have to establish himself as a legit starting PG. Barrett would have to be a top rook. Mitch would have to improve and not foul so much. And some instant chemistry would have to arrive. With Randle playing at an all-star level and two of Morris, Knox, Portis contributing strongly.
We'd also need to get good 3-point shooting (group effort?), solid defense, and someone (or two) emerge as a go-to scorer.
Seems like an awful ot to ask. Hell, all that happens and we could get 42 W's.