Explain his involvement. You must have read a different report than I did. The one I read said he removed himself from the bad influence of 4 teammates.
Dyer was hanging out with his friends, who said they wanted to go rob a house. Dyer left and went home. His buddy later came over and picked up the gun, although Dyer alleges that he tried to talk him out of actually using it to rob someone. (This is from the local newspaper.) Read that again - Dyer either gave him or let him take the gun. He was not prosecuted - I assume because he was willing to testify against his friend.
In addition to his issues with the criminal justice system, there have been reports of grade issues:
"In a story by Roopstigo.com which alleges NCAA violations including potential academic fraud during the Tigers' run to the 2010 national championship, Dyer was mentioned as one of 'as many as nine' Auburn players who were academically ineligible and wouldn't be able to play in the 2011 BCS Championship game. We thought we would be without Mike Dyer because he said he was one of them, but Auburn found a way to make those dudes eligible," said former Auburn player Mike Blanc, according to roopstigo.com. (According to a Rivals.com report, Blanc denied he said it.)"
(USATODAY, 2013)
And attitude issues:
"Dyer's attitude has been an issue all year, but it appears that his actions have gotten him sidelined for at least one game. When your best player has attitude problems, and there's not enough talent surrounding him to cover for it, your team has a serious problem."
(al.com, 2011)
My point is just that you can't try to pretend the guy has kept his nose clean.