With Oklahoma benching Jackson Arnold and turning to true freshman quarterback Michael Hawkins just before halftime, Tennessee and head coach Josh Heupel will likely need to adjust. And Heupel isn’t ruling out seeing Arnold some more in the second half. While Hawkins played a series at the end of the half, it’s possible Arnold starts the second half again. Either way, Heupel will try to have his team ready for both. “Be ready for either one of them,” Heupel said to ESPN sideline reporter Holly Rowe at the half. “Both of them have the ability to run so we’ve gotta do a good job of playing some …