As has been mentioned elsewhere, the most impactful loss to our "big" rotation is Tatum. He did more of the dirty work than anyone. Tatum led BOS in total rebounds and rebounds per game. He was 17th in the entire league in total rebounds. For some of the other names mentioned, Sabonis was 2nd, Vucevic was 12th, so both right up there (this is based on total rebounds, not per game).
We have our core big 3 of White, Brown, Tatum; a guard, a guard/wing, and a forward (I don't care about this season, the dream big has to work for 2026-27 and beyond). To that, you could add 1 guard (say Pritchard) and 1 big (TBD), or you could add 2 bigs:
Option 1: Pritchard, White, Brown, Tatum, Dream Big
Option 1A: White, Hauser, Brown, Tatum, Dream Big (if you like Hauser better)
Option 2: White, Brown, Tatum, Forward-TBD, Dream Big
I explain all of this because it makes a difference in my mind as to what the "dream big" would be. Option 1 is most likely. We have Pritchard in hand so it only requires 1 addition to the core. But if we could trade Simons for a Pritchard level PF, maybe we are better off. And then depending on the skills of this PF, it might change what is the best fit for the dream big. Vucevic is potentially interesting, but I am not sure if he would be better in a 1 big or a 2 big line up. He might be better in that PF role, and then add a C somehow. Maybe trading the draft pick for 2026 plus a TPE.