As a point guard, which is where Doncic would play for the Phoenix Suns, his handles are average to slightly above average for a point guard.
But, as a Small Forward, which is where he would play for the Kings, Doncic handles, passing and court vision are superior. His step back fade away is Harden-like. There are not many small forwards that have his handles and court Vision. That is where I can see him break down a defense and get his teammates easy looks.
Doncic has the size for the NBA, but he does need to tone up and lose the baby fat.
Once he strengthens up and matures, I could see him as a 18-20pts, 6 reb, 6 assist per game small forward.