How about AB & Sully for Kaman, Mike Miller, and Portland's 2016 1st with light protection?
That trade could really turn fortunes around for Portland by adding the scoring punch their crowded frontcourt needs. Also, Bradley is an ideal fit alongside Lillard, who is a subpar defender. If they can live with top 3 protection on their upcoming pick, they might improve enough to keep the pick anyway--
Lillard
Bradley/Harkless
Henderson/Aminu
Sully/Davis
Plumblee/Vonleh/Leonard
I like it for the Celts because we add another pick instead of just cutting decent players. Obviously we would cut Miller & Kaman, but really this is about moving on from players that, while good, are clogging up our rotation at the moment. At some point we'll have to choose between Sully & Oly and, IMO, this offseason is as good of time as any. Johnson and Lee should be fantastic for us up front anyways. As much as I hate to say it, might be addition by subtraction because you'll never have to worry about the 5'9/6'1 backcourt of Avery & Isiaah.
Thomas Rozier
Smart Turner Hunter Young
Crowder Jerebko PJ3
Johnson Olynyk
Lee Zeller Mickey Holmes
Leaves some room for Ainge to work with, not to mention giving us potentially four first round picks in the upcoming draft three of which with lotto potential. That'd be a silly amount of cap space & picks for a 50 win team.