Marshawn is my favorite player.
I just don't think he cares for BS. There's been a quality amount of interviews and interactions of him out there (Beast Mode Play breakdown, Sports Science, a couple videos of him have been posted in this thread) and in all them, he's the same guy, speakin' the same lingo he always does.
But interviews for football? Those things were everyone says "We've been practicing real hard and just do your job, don't quit, blah blah blah"
He would either have to bottle up his personality and spit out cliches, or be himself and have the media pick apart what he says.
Beast just doesn't have time for that.