https://www.jordanthrilla.com/post/anonymous-doctor-explains-why-zion-williamson-knee-soreness-issue-can-t-be-fixed
In the photo above, you see a picture from Zion's rookie photo shoot. If you look closely at his knees you realize he is extremely knock kneed. This means his knees point inward at a concave angle, almost like a slight L shape.
What this does is put extreme pressure on the MCL region of the inside of his knee. It also causes the outside LCL region of his knee to bump against each other, every time he jumps and lands, since the knee is folding inward. His knee structure causes his knee joint to become the extreme pressure point on all his jumping and landing movements, a quick recipe for knee soreness. This may be the reason why he is battling knee soreness only after light minutes in a few preseason games.
Lebron James has the ideal knee structure. He is slightly bow legged, yet still has a straight line structure on the outside of his knee. This type of knee structure balances forces well, taking pressure off the joint itself. This is why Lebron James has never had knee issues. As you can see, Zion's knee structure is drastically different. His knees are bending in, which makes his knee joint become the place on his leg that takes the brunt of all force when he lands from jumping or running.
Pelicans can make him lose weight, but it still wouldn't fix the underlying problem. Zion Williamson will likely have to battle severe knee soreness as long as he is in the NBA. You can't really blame him for it either, because the issue is likely the natural knock knee structure of his knees.
