Former Wolverine long snapper Sean Griffin said that most of the allegations are from "disgruntled ex-players or guys who transferred."
Griffin said he voluntarily worked with coaches during down time, and there was never a member of the coaching staff monitoring him.
"When I was helping with the specialists, there was never a coach, a graduate assistant, or a quality control coach there," he said. "I wasn't sitting there writing everything down and reporting to a coach. I worked out with a few of the new guys.
"I would just do that because people helped me out when I was younger."