Celtics have enough PG's and I don't see Fultz fitting with Simmons. Also, what position does Johnathan Isaac play? If he's a 3 the pelicans look good, but getting another 4 with Davis and they already have diallo.
Fultz can play with Simmons but Simmons gonna have to play without the ball more than he's probably comfortable. Ball and him would be a more natural fit but I have a sneaky feeling that Ball's game won't translate well to the NBA level