I love how Gruden is calling out the fact that Graham is just a big WR, and now that teams are treating him like one and defending him with corners, he's being held in check. Belichick was way ahead of the curve on that (see: Talib shutting him down last year), and I've been arguing that the Graham vs. Gronk debate for best TE isn't a debate at all since Graham isn't a TE ever since.
If a defense can put a corner on you, and the offense doesn't respond by running down their throat right behind you, then you're not a tight end.