MIAMI GARDENS, Fla. —To say another clash of the Leftwich brothers was foreseeable is the ultimate understatement. If anything, it was an inevitability in a home where their mother, LaTonne, likes to say that anything could be turned into a weapon. Mack and Cutter Leftwich were supposed to play each other in last season’s First Responder Bowl. But Mack, then at Texas State, left to become the offensive coordinator at Texas Tech before he could face his brother. Cutter, then the offensive line coach at North Texas, returned to Oregon as the assistant offensive line coach last winter. The possibility of them coaching against each other this season was floated during a podcast recorded last...