Rubbish
As soon as a ref says he saw it and decided there was nothing in it, the FA can no longer act, its a standard rule regarding the Ref being the Sole person charge, its been lime that since day dot.
The FA will never re-referee a game, or return to an incident.
Its the reason Cards don't get Upgraded, or players dont receive bans for violent Conduct, when a Ref has acted.
Cunha's incident was obviously not mentioned, Therefore the FA are free to act.
Viloent Conduct is a Minimum 3 game Ban 5 second Google will show this.
The only fucking thing you actually got right was the Conjecture thing.
The court Of Arbitration in Sport can decide a Ban is too heavy, and will take other punishments in to account, so its a Fair conjecture, that a Violent Misonduct will mean a greater ban than Misconduct.
However thats by no means certain. I am.surprised it was not Violent Misconduct given the TV footage