As much as I would love to see DQ in Dallas (I am a diehard Terps fan), I don't think he's a fit for Parcells' 3-4 defense, only because of his size. Would he make plays? Yeah, he would, but his size goes against "typical" 3-4 LB size. He could probably earn Parcells' respect as a player, like Dat and Dex did, but I doubt he would get that chance.
And last year, I thought Blackstock was a more complete player than Brooks was.