I put this in the other MIL thread. I love Henson on the Celtics. He has a Poison Pill if traded because of the extension he signed, so you have to throw in contracts on both sides.
I proposed Henson with Vasquez/Mayo/Bayless for Lee, Sullinger, Young, and Turner.
Henson would be a great fit at center. The Bucks are using him as a backup at center behind Monroe. The only reason they do the trade is if they dont want to pay him $11 mil per year to be a backup. They get a rental on Sullinger and see if they want to extend him.