21 has no case re: his last PI. Yes, when you grab the receiver's collar and push him down while you put your other hand up and jump, it's pass interference.
Hence my comment. NY dude did push off but that was after constant PI by the defender. Flag should have been flying before the push off. As soon as the ball was in the air. Hell, it was defensive holding before that!
They're never going to restore the integrity of the game. Even if completely separated from gambling right now, it's still going to have the taint of instant wager via internet.