On a 3rd down play late in the 4th, Miami shifted its defensive line right, to confuse Favre. Now Crowder (arrow) is the guy who came up to the line to stop a run to that side.
But what Miami did was to overstack on the right side to create mayhem and mix up the blockers. You don't see this often in the pros, because the offense can usually overcome it and exploit it.
But, in this case, they used it to take advantage of an aging Favre who was having trouble getting the ball into players, anyway.