For FA to take action the officials must admit that they did not see what happened, if they saw it and did not seem any action to be taken that is the end of it
The FA are as scared of Barton as Pawson was on Saturday. Cowards to a man.
The incompetence and cowardice of match officials and the FA is why we have to introduce citing officers as in Rugby Union. This will then force the FA into action and lead to incompetent (or bent) officials being kicked out of the game.