I will always believe the Podz story turns out differently if he had been promised playing time at Illinois...
That perceived rejection may well have been the fuel he needed to push himself to become what he is today. Every hero has an origin story, right?
Saying he couldn't have possibly gotten that much better in an off-season doesn't make much sense. It's literally ignoring decades of evidence to the contrary.
Always reminds me of the old Al Maguire quote: "The best thing about freshmen is that they become sophomores."
There is also something very freeing to being the #1 option on a team, and not having to look at the bench every time you mess up... Some guys need to be pushed hard, and some guys need to be insulated. If you are the 2nd type, Illinois may not be the place for you.
Promising playing time isn't something Brad is going to do, nor should he.
Some people are simply a bad match for each other, even if they are both great individually.