I think Jayson Tatum has a very high floor and a ceiling of a multiple all-star (though not a superstar).
I haven't gotten much agreement on here. But I do think Tatum will be the best going back and forth from a 2 to a 3. He could guard a 4 at times also, but i'd prefer not to. I think his defense will be very good at the 2, adequate to good at the 3 and poor to adequate at the 4.
I think he has the foot speed to guard quick players and will have strength/size to over power them.. He also has a very wide stride that makes him deceptively quick driving to the hoop and creating space on the offensive end.
Since I project him as a guard and will compare him to guards in my comparisons which I believe are:
Floor: Khris Middleton with just slightly worse defense.
Ceiling: Klay Thompson
Klay Thompson may not be a superstar, but can take over games for stretches like a superstar. That's the kind of play I think Tatum is. I've watching him in interviews, he's a very intelligent player and thought of as a hard worker. Which is evident in his consistency all year for Duke. I felt like any time a read the box score he had 16-20 points, and that was even when his 3-point shot wasn't falling.