It's really hard for me to see this deal occurring. Griffin has such a high salary, it takes a lot of outgoing salary to match. Meanwhile, Gay as an outgoing piece for Sacramento doesn't make enough for all of the salary to go back that direction from Boston.
Still, it could be a cheaper alternative, because Doc doesn't like draft picks and prospects, and Gay can't have nearly the acquisition cost of some players, so Sacramento shouldn't need as much in return. But then again, I can't remember the last time a rumored trade occurred remotely resembling the original rumors, especially one that had been rumored for several days. Dwight to LA a few years ago sounded like it would happen, but not as a huge four-team deal.