NORMAN — Brent Venables had high expectations for new tight ends coach Jason Witten after the legendary future Pro Football Hall of Famer joined Oklahoma’s coaching staff shortly after last season. Witten was brought in to help boost a position group that has struggled mightily in recent seasons under previous coach Joe Jon Finley. While the Sooners have yet to play a game with Witten coaching, Venables said the difference in the group has been readily apparent. Witten has never coached in college football, and much of the time, great players who get into coaching struggle. He also praised Witten for the way he’s gelled with the rest of the coaching staff and with the way he’s interacted with Venables during meetings.