This is a great piece on the Ryan family and how Buddy et fils have changed football. I thought that this quote from Rob Ryan informs the whole discussion on running QBs and whether or not it's smart in a physical league.
"Rex used many of their ideas, mixed with two cornerstone principles. One: Stop the run. "Say what you want about me," says Ryan, "but if I want to, I'll stop your run." Two: Knock the quarterback on his back, for the simple reason best expressed by Rob Ryan (who in 2009 was Eric Mangini's defensive coordinator with the Browns). "The more you hit the quarterback," Rob says, "the better you're going to do.""