Yup, also there may be times different teams neurologist could possibly recommend a player not return and not necessarily a no he can't return. In instances similar to that being could be risky if player returned but not enough to say "no, he can't return this game", So in that "grey" area, it would leave the decision to someone else to go against that recommendation if deciding to risk it.
I don't know, but I would be interested to hear the discussion when this went down