Oklahoma assistant coach Mike Stoops appeared to accuse Charles Walker of quitting on his teammates.Just days after Charles Walker told Bob Stoops that he was leaving the team to prepare for the NFL Draft, Oklahoma defensive coordinator and brother of Bob Stoops, Mike Stoops, criticized Walker for his decision.Walker has missed the last six games after suffering a concussion in the Sooners game against TCU. The defensive tackle is projected as a high pick in this year’s NFL Draft. According to NBCSports, the concussion Walker suffered in the game against TCU was the defensive tackle’s second in just 10 months. It appears he made a business decision to leave the team in order to prepare for his future.Well, Mike Stoops wasn’t having any of it. Stoops called out Walker for quitting on his teammates:“Quitting on your teammates is hard to take, as a coach. That’s everything we stand for — our commitment to one another and, for whatever reason, that wasn’t there for him. He thought this was a better avenue so you would have to ask him for those (answers). …“[Y]ou can’t have guys coming and going and have a group of players committed to what they’re doing day in and day out, putting all the time and energy into it. It’s not fair to the players that are on our team if they’re not committed to the team.”Oklahoma is fighting for a Big 12 title and perhaps a spot in the College Football Playoff. The Sooners have two games remaining, against West Virginia this week and a rivalry game against Oklahoma State next weekend.