For this season, I could see things going various different ways with Tillman. I think he has the skillset to be a good backup big on this team, but he still is working on learning the system. Obviously he has to figure that out before he can be a regular playoff option. If he does, then his minutes could either come from Kornet or from Pritchard with the Celtics going to more of a consistent 2-big look. I think the latter is a real possibility if Pritchard's defense doesn't hold up in the playoffs. Right now they use a mix of 1- and 2- big lineups and Pritchard gets 20 minutes per game. If they go to more 2-big looks he is the guy who will lose minutes with Brown playing more at the 2 than the 3, Tatum more at the 3 than the 4. Previously, Grant and Horford both filled roles as bigs who could handle being switched out onto the perimeter. XT is bigger than Grant who was always a smallish big, but he can do some of that.
Anyway, I wouldn't be surprised if he's just a spot minutes guy in the playoffs or if he carves out more of a regular role.