well the patriots kind of started that and allowed it by letting bell go in their parade with a bitch mode shirt (When funny enough that very season didn't he do everything to he could to get kicked off the steelers so he could be back with the pats?)
probably imo one of the most controversial seasons I've watched in terms of the steelers and bell, the inflate crap, the concussion protocols not properly being enforced on both teams.
So as for lynch signing that shirt, good for him. Happy to see him rep the seahawks in one way or another. Afterall he didn't have to write seahawks. He could have just wrote the beast mode bitch.