I still don't think that was really a dirty hit against Carolina. The guy even pulled up and even stopped before hit hit him and Olave's momentum ran him right into the guy. It wasn't really even that hard of a hit. I'm not sure what he was supposed to do, choose not to tackle or move out of the way? And yes, I know the NFL fined him. The NFL loves to throw out fines to pretend that they care about player safety.
Anyway, it was just a hard hit and it probably would not have caused a concussion had he not come back too soon from the prior concussion.