I actually think you'd be better off getting a PG like Darren Collison as your PG for a roster like that, spread the floor, make smart decisions. Lavine/Kawhi both would want ball in their hands, adding Ball to mix may be too many players that need ball to be productive and Ball would be sagged off of too much.
If we get Zion, I just want a focus on 3 and D guys. Surround him with as much shooting as possible.