Apr. 23—Oklahoma landed a pair of key additions up front in the transfer portal over the weekend. The Sooners need veteran talent on the offensive line and that’s what they’re going to get in SMU transfer Branson Hickman. The 6-3, 294-pound inside offensive lineman was a three-year starter with the Mustangs. Hickman confirmed his decision to transfer to Oklahoma on X the day after the Sooners’…