You’re trying to make it more confusing than it should be. If the returner waves his hand above the shoulders, it’s a fair catch. Anything else and he’s fair game. - so long as they give him an opportunity to catch the ball. Otherwise you play to the whistle as everyone is taught.The point is to prevent the defense from having to guess whether a fair catch is valid or not. It also is a penalty to hit a punt return that has called fair catch. It should be absolutely clear. If Cooper had known how it would be called invalid, the Cooper is super smart on the field and wouldn't have made any motion with the off hand.
The enforcement has been spotty for long, long time and that is why it seems unfair---one review with a jock itch about fair catch signaling decided to step in and decide a game on his own. A different reveiw official probably wouldn't have called it.
to me, having this second rule just adds to the confusion. There is already a rule that defines what a fair catch signal is. Any coaching staff worth their paychecks would make their players aware of the rule, as well as clarifying with officials on game day how they coach their players to signal so everyone’s clear on what’s going on. No one on the field - players, coaches or officials, thought cooper was signaling a fair catch. Only the guy looking down from 500 ft up in the air thought so.
if nothing else, the idea that he saw enough to overturn what wasn’t called on the field is absurd.