Regarding 2 or three stars, with two stars, coaches will strive to have both of them off the court very little to no minutes and might have just one star on the court a bunch.
But with three stars, you can pretty much set a rotation where you have two stars on the court at all times. That is what will make the team better and keep all three stars happy. There is no reason why, with this roster:
PG - Beal, Pritchard, Edwards
SG - Fournier, Langford
SF - Brown, Ojeleye
PF - Tatum, Parker, G. Williams
C - Horford, Brown, Kornet
That Brown, Tatum and Beal could all get 18-19 shots a game and be 22-23 PPG(or more) players and also have Fournier giving you 14-16 PPG.
That many great to excellent offensive players on the floor is going to mean a lot of wide open looks and high scoring efficiency, especially if Brown and Tatum can actually start having fouls called for them and put them at the line 6-8 times a game.
A lot would depend on Ime's offensive system. If it's based on San Antonio's and not Stevens' system, I think those three stars and Fournier could be lethal