Boston out: bass and maybe some 2nd round picks
Boston in: Thomas Robinson and Allen Crabbe
I'm genuinely curious why you think this is a good trade. not picking on you, just looking for a reason why the C's would have any reason to do this.
TRob has been in the league only a few years and has bounced around several times because he's not particularly good. The potential people thought he had has never materialized. He'll be lucky to hang on in the league next year in a journeyman role.
Bass is a productive player when in the right system. can defend decently. can hit regularly from 17 feet and in. now expanding his range to the 3. definitely a quality backup PF that can spot start as needed on a very good team. also an expiring deal this year.
I'm all for trading Bass for a better player or another asset (prospect/pick) but he's a much better player than TRob is now or is expected to ever be. This trade doesn't accomplish that. If it was for TRob and a first, that would be worth considering or better yet, someone other than TRob who isn't another PF to clog up that position on the C's (which TRob would do--not that TRob would get any PT behind Sully and KO)