This much we know. Fultz has legit NBA Shooting guard size. He can shoot. He's great in the pick and roll game. He's got great handles.
He could be among the best passing and playmaking off guards in the league and put up prime D Wade type assists numbers.
He will make life easier for Thomas, it should help improve IT'S health and longevity. Meaning Thomas can pick his spots now driving to the rim, and knock down even more open three's.
We are talking about a potentially lethal combination of Thomas Fultz Hayward combination. Knock down shooters all if them, and they hall can handle and drive. Brad Stevens heaven.