Agreed, but there was already a good bit of chatter / questioning following his return last week.I will play devils advocate for a moment. Just because Tua has a concussion this week doesn't mean he had one last week.
Now having said that last week sure looked like a concussion. Not only was he wobbley, but you can see him kind of shake his head at on point.
Occam's razor makes me think this is carry-over - the 'fins took a risk and it backfired.