BOULDER — After losing all three starting defensive linemen to graduation, the Colorado football team is finding a variety of ways to fill those holes. They’re even taking another look at George Frazier. The fifth-year senior tight end and fullback is practicing at defensive line this spring. “I thought about it and asked (head coach Mike MacIntyre) about it, and once I brought it up, he knew exactly where I was going with it,” Frazier said.