Joe Castiglione is closing in on completing his third decade at the helm of the Oklahoma athletic department, having served as the athletic director in Norman since July 1998. And though the man in charge has plenty left in the tank, he is considerate of what he’d like things to look like when he does hang it up. And for Castiglione, the hope is that all things Sooners can not only maintain success, but continue achieving at higher and higher levels. “But I hope when the time comes that I leave Oklahoma in the best position possible,” Castiglione said. “That’s my dream, to leave Oklahoma with …