this is what happened...
they video tape the defensive signals...
the pats then go in at halftime compare the video to their eye in the sky Polaroids and then say this signal means this defense...so in the 2nd half they will know this signal means they are blitzing from the right or whatever.
then the coach calls in to Brady using the in helmet speaker/mic and gives him the hot play.
Brady doesn't have to be in on it...
i really think its probably only like 3 or 4 coaches in on the videotaping...something like this you wouldn't want everyone knowing about

Can you imagine the advantage an offense has if they know a blitz is coming from the right side leaving Moss in
triple coverage? You give that detailed information to a QB like Brady and it is lights out. See final score and Moss's stats against the Jets.
My opinion if the Pats are found guilty:
$250,000 Fine
Loss of a 3rd
4 game suspension for the Coach