He didn't really have that bad of a senior year, honestly. I think he still had 10 sacks and about 15-16 TFL's.
I truly believe there is a phenomenon where if a projected Top 10 pick junior stays for his senior year he gets a bit over analyzed and nitpicked over because he's in all the preseason publications and people get tired of hearing about him. His stock loses steam and starts gets a little stale. Think about all the fallers the last couple of years ... Kiwanuka, Alan Branch, Brady Quinn, Matt Leinart. They were all projected to be Top 10 picks as juniors. Its like draftniks are kids at Christmas. All of last year's toys get tossed on the closet floor because they're infatuated with the new toys.