Right now best I would do for Sanders is take on Mayo and give them all expiring deals.
Sanders and Mayo
For Thornton, Bogans, Anthony and CJ.
Bucks can cut CJ and Bogans saving 6 million. Get out of Mayo and Sanders bad contracts.
Mayo is off same year as Wallace and Green so that is C's big FA shot.
throw in a couple of picks (LA and future protected pick) and I think they might do that and makes some sense for Boston as well. I do think they will want Ilyasova included as well and frankly that makes a bit more sense. So maybe you include Bass (and Babb since he would have to be cut anyway) and just the LAC pick (and not a future pick)
So Boston post-trade is
PG - Rondo, Smart, Pressey
SG - Mayo, Bradley, Smart
SF - Green, Turner, Mayo, Wallace, Young
PF - Sullinger, Ilyasova, Olynyk
C - Sanders, Zeller, Faverani
Still have a log jam at SG and SF, but I think that provides a better and more balanced team overall, which does shore up a bit some of the teams deficiencies (a good rim protector in Sanders and some better scoring in the starting line up with Mayo). Team still needs a #1 scoring option, but is in a better place overall.
All that said, I'm still not sure I would want to make that trade and use the cap room on a team that doesn't really jump up into true contention.