My Guess? Thomas Robinson.
Obviously has some red flags but lets be honest, most of these guys do. He's averaged around 5-6 rebounds for every 15 minutes he plays and is certainly capable of grabbing more boards with more minutes. Hasn't played with a great coach besides Terry Stotts of Portland, and his last two teams were tanking teams with bad-to-mediocre coaches as well (Lakers, Nets).
Could be a bruiser along with Baynes off the bench, and another one of Stevens' reclamation projects. The best part is that he's young (26 y/o) and electric inside the paint. Could be another "chip on his shoulder" kind of guy who can overachieve and help us out in dealing with the likes of Mr. Kardashian and Marcin Gortat among others, especially in playoffs. Also, Robinson had a 28.1% defensive rebounding rate, and the top guy for the C's last season was Kelly Olynyk at 20.1% LOL.
With Zizic now gone to Cleveland, C's need another depth big and Robinson would be a great fit. Normally I'd say Bogut but at this point, he's just very injury prone with glass for legs. A lot more riskier than Robinson now IMHO.
What do you guys think?