They definitely could...but I don't like the edge rushers around the first round range other than Ezeiruaku and Scourton, and I'd have to trade down to be fine with Scourton. Stewart reminds me of Vernon Gholston: looks like Tarzan, plays like Jane, except even Gholston had better stats and film at Ohio State. He's on my DND list. Green and Pearce have serious character issues that struck them off my draft list. Mykel Williams is very raw and wouldn't contribute much his first year (but you could probably convince me that he would be a good pick if he was picked by us). Wouldn't be my favorite pick, but I could eventually accept it (much like the category Milroe's currently in).
But Green has had two sexual assault charges (that were just charges, not indictments, to be fair, but still too Roethlisberger-like): one in high school, and one at Ohio State. There's nothing that could justify taking him.