Right, but that wasn't someone calling Gruden to tell him what the Raiders were doing. Bill Callahan NEVER changed a thing from Gruden's offense and Gruden was able to figure that out for himself.
Doing stuff like this (like RJ calling out Jacksonville's formations) during a game is harmless to me. It's like stealing signs in baseball....if you're able to do it with the naked eye, then more power to you. Every team in every sport these days should be able to change stuff like signs, play calls, formation names, etc. before they play their next opponent. It's part of the strategy these days to prevent the opponent from figuring out your signals.
After thinking about it, I'll retract the investigation comment. Even if it was true and even if it did violate some league rule, who would you punish and how? If you suspend Favre, why should the Jets pay for it (not that I'd mind)? If you suspend/fine Marinelli, why should he have to be punished?
In the end, it really just makes Favre look like a pr*ck.