And I'm sure if that was your son who just had that concussion, you'd be happy as a clam that he was "cleared" to play with no worries whatsoever. I'm not saying Lee shouldn't play, hell, if he's cleared and he thinks he's ready to go, more power to him, the coaches, and doctors. What I'm saying is I wouldn't play him for at least a game, period.
Evidence has not shown that baseline tests are always reliable and useful. Quality care and decision making can still be provided based on tests done after injury - just like with most other health conditions or injuries. A truly comprehensive baseline assessment is difficult and expensive to administer and takes a lot of time, so it is rarely done.
Most of the time baseline tests are of a single type (like the ImPACT test) and only assess a small number of issues. Concussions are a complex injury that have a wide variety of potential symptoms and issues, so unless they test absolutely everything there will be missing key information.
Funny, you've not addressed the fact that a concussion is a brain injury, and like I said, it takes time to heal just like any other. And you certainly can be cleared to play with the protocol and baseline tests, doesn't mean the injury has gone away. Sure, you can play with it, just like a sprained ankle, but the risks, as we're seeing more and more all the time, make a good case to at least sit a player for one game.
Certainly I'm no MD, but my cousin here in Denver is a top neurological doctor. I asked him today if Tanner Lee was his son, who was cleared to play this Saturday, would he advise him to play? His answer was an emphatic NO, and he's as big a Nebraska fan as you or I.
And your right, there's no real issue here, just a difference of opinion.