everyone steals signals in the nfl. all ex-coaches and ex-players have been saying it all week. AND the signs you steal will not help you at all during the game being played, it only helps if you face that team again later.
i say this is no big deal, even if you know the play coming you still have to line up and stop them.
They steal signals in baseball every play. Does anyone care about that? Nooooooooooooooo.