For me the dream scenario is for Ainge to find a way to grab Terrence Jones. I don't think it's terribly likely, but with the Rockets desperate to get cap space it isn't completely impossible.
I know grabbing Jones gives us a real logjam at the power forward spot, but I think he projects better than either Sully or Kelly (as much as I like those two). He is still really young and improved massively this past season. He's already a good rebounder and good defender. He has great hands (he, like, never fumbles the ball. Ever). He's already a super efficient scorer around the basket, he draws fouls, and while he isn't a good 3-point shooter he still improved to be just north of 30% from there last season.