I did not see the play for this Tua concussion, but I recall the last one didn't seem like that much of a hit either. If he is getting concussed just with these relatively minor hits, what is going to happen if he takes a real hard shot to the head, inadvertently or otherwise?
I think he is a good, above average, NFL QB, but not great or top tier. You can get to the super bowl with that level of QB. Of course you need the rest of the team and the coach to be very good, you can't have any holes or weakness, no matter how good the QB is. A CBS Sports QB Power Ranking had Tua at #10, right in there with Prescott, Stafford, Burrow, Herbert, and a few other good QBs. That might be a little high, but not too far off.