Expect defensive line coach Jeff Zgonina to take advantage of the depth at his disposal. He's said his group will be in constant rotation in order to keep fresh bodies on the field. I'm assuming the "Twin Towers" you're referring to are Arik Armstead and DeForest Buckner. It's possible that those two could be on the field at the same time with Armstead at LEO and Buckner at the 3-tech. It's also possible that they're on different personnel groupings and both see playing time, just not together. The addition of Elvis Dumervil is a wildcard here. Should he prove to be healthy and productive, it's logical that he'd receive a bulk of the snaps at the LEO position on passing downs.