Linemen and use their quicker and lateral speed to exploit gaps to stunt and blitz every down.
The key is guessing correctly more often then incorrectly.
It's a gamble, but it isn't a threat to disregard. I've watched 220lb linebackers spin circles around giant linemen.
The big issue is there a disparity on the other side as well as that is hard to exploit and BYU d would be licking their chops.