Just like every other player that experiences a concussion of any degree Olave went through the league's concussion protocol which requires as a final of five steps being "cleared by both the club physician and the independent neurological consultant to return to full activity". From what I have heard that basically means it has been determined that the player is subject to no greater danger than any other player playing the same position.

The player is more aware of any risk and is in a better position than any of us to weigh any risk. Playing in the NFL is risky for every player. That's one major reason why they get paid as much as they do. Let's not forget that these players have committed their entire lives to the privilege of playing in the league.

Whilst you are probably right about the level of concussions received, anyone can believe that repeated bouts of the same injury can't be a good thing. Medicine is always evolving, so maybe there just isn't a good enough set of procedures yet to see what 4 concussions in 2 years actually looks like for the individual in later years.

As for the last point, "IF" Olave did choose to hang the cleats up, I'd consider him a very bright individual for not worrying about what others think about NFL toughness levels and instead prioritizing his future health.