I have always thought that Sabonis would be and ideal PF to play with Tatum. I don't think his defense is all that bad, playing as a PF (I like him at PF, not C). He can score inside and outside, rebounds, hustles, I like him. Would allow BOS to move Tatum to wing. The salary is the issue. Probably have to trade White, but I would be OK with that. I think Sabonis has more value.
But I don't see how a trade could work. The following players work financially:
White and Simons
for
Sabonis and Devon Carter
But I don't see SAC being so interested in these players, so it would have to be at least a 3-way deal with White going to a contender (maybe HOU) and young players and picks going to SAC from that team. BOS would then look as follows:
Pritchard
Brown
Tatum
Sabonis
Queta
...with a pretty weak bench (Hauser, Garza, Minott, Hugo, and so on). I like the size of that unit, I see enough scoring/creation to cover up for Queta's lack of offense. That unit would not give up many ORebs at least. All 5 players are at least good rebounders for their positions (even Pritchard). BOS would have to go out and get some guard depth, but that is generally easier than going out and finding PF or C depth.