Greene was good but wasn't the talent Montgomery was. David was able to do what he did with some pretty bad and inexperienced O-Lines, Greene's lines were very talented. And last year David was definitely great but Purdy was also great without him. The first game Purdy got thrown to the wolves against Oklahoma State, David was injured and Purdy was phenomenal. He also didn't play in half of the Baylor game or half of the Texas game and Purdy held his own. The Texas game missing David definitely hurt but we were still only down 10 I believe at half. Our line will be immensely better, which will help the new running backs and also take pressure off Purdy to have to make every play on his own.