STILLWATER — Owning one of the best offenses in the nation has its drawbacks.Outside receivers coach Gunter Brewer left Oklahoma State on Wednesday to join the coaching staff at Mississippi, becoming the third OSU offensive coach to leave the program after the 2010 season. Brewer will become an associate head coach, passing game coordinator and receivers coach at Ole Miss. “Too good of an offer not to go,” Brewer said. “I’ve done about as much I could in the (receivers coach) position. I didn’t know how I was going to be in the mix there (for offensive coordinator). “There’s no animosity or ill will towards (OSU) or Coach (Mike) Gundy.” Brewer joins former offensive coordinator Dana Holgorsen and running backs coach Robert Gillespie, who left the program to join the West Virginia coaching staff, as OSU departures. Two key reasons for Brewer’s departure was the opportunity to go to Ole Miss — a place where his father, Billy Brewer, coached and he considers home — and get a promotion. “There’s potential for play-calling duties, and associate head coach kind of gets me a step towards becoming a head coach,” said Brewer, who coached Adarius Bowman, Justin Blackmon and Dez Bryant while at OSU. Keeping some continuity in the OSU offensive attack has been a high priority for Gundy, and it could be tough to do with three of the five offensive coaches on staff in 2009 no longer a part of the program. “He’ll have thousands applying for those positions,” Brewer said. The departures give Gundy the option to decide to allow the Pokes’ new offensive coordinator to bring along a coach to fill either the open running backs coach position or receivers coach position, if he chooses. But with Brandon Weeden and Blackmon — one of the nation’s top quarterback and receiver duos — returning, the Cowboys’ open offensive coordinator position is already very attractive. In addition, Gundy said last week the hiring of a quality running backs coach is just as important as hiring a quality offensive coordinator. “The running back hire is really important,” he said. “Because you have two young running backs (Joseph Randle, Jeremy Smith) that are good players. And eventually we are going to bring in guys down the line that are those caliber of players.” Like current running back commitment Herschel Sims of Abilene (Texas). Sims, a top 100 national recruit, has indicated he would like to see a running backs coach in place before he makes a final decision. And Sims, who has said he plans to take other visits despite his commitment to the Pokes, is slated to visit Stillwater this weekend, so a final decision on a running backs coach could be made soon.