OK, here is a picture of Donnie from a year ago before he transferred to IMG. Look at his freaking calves, ok?
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Let's compare Kevin Durant. This picture of Kevin Durant shows him wearing protective padding on his legs. And look how damn skinny his calves are:
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Donnie is not any more of a 4 than Kevin Durant is. Yes, of course he's the tallest guy on his HS team, so they play him at center. He's not a center in college, and he's a small forward in the NBA. He will never be strong enough in his lower body to be an NBA 4 or 5.
Do any of you watch what players look like physically in the NBA? Devin Booker is a 6-7, 225 or so shooting guard. Very physical, talented player. Or think of Jayson Tatum of the Celtics, another 6-7 swingman who is a stud athlete. Booker outweighs Freeman by 30-40 pounds.
Freeman is a HS 5, College 4 evolving into a 3 (like Billy Owens did), and an NBA 3. That's his player development arc.