Things went south for starting quarterback Jackson Arnold in Oklahoma‘s tilt with Tennessee on Saturday night, with the starter benched for a freshman in Michael Hawkins. Coach Brent Venables had just had enough of the mental mistakes and the surprising gaffes Arnold made, costing the team in a close game. CLICK HERE to go to PrizePicks and use code ON3 to receive a guaranteed $50 once you play $5 in lineups! But despite the benching and the fact that Oklahoma will stick with Hawkins going forward for now, Venables wants his previous starter to know he’s still got plenty of support. “We needed…