New on SI: The Cowboys Are Now Fully Dak Prescott’s Team. He Says He’s Ready

After a sophomore slump, Dallas’s QB has to step it up in Year 3—and he says he knows what he needs to do to make it happen. Plus, Philip Rivers still loves this game, the Rams try to keep ahead of the curve, the Browns’ Aaron Rodgers plan for Mayfield, and more as training camp powers on