From pictures, he looks the part.
He wants on the field. It was his decision. He wanted to move to WR last fall but the coaches wouldn't let him.
He must not have felt like he was not good enough to beat out the others... why else would he want the switch laat fall? Must have seen the writing on the wall and didn't want to ride the bench for 3 more years.
I am sure he knows where he was sitting on the depth chart.
If he still has the wheels that he (per recruiting sites) had in high school, the WR is a good fit for him. Strong and fast.
As far as concussions go, he has had two, with one being severe. Many fb players have had multuple concussions and now we know some of the possible after effects later in life. Surely he knows this, so if he wants to play still, I say let him.