Even if Mahomes is the best QB for the next ten years that contract will limit the Chiefs, Kelce only has a few more elite years left and the AFC is about to have 7-8 really solid QBs. Good luck getting to 7 Superbowls let alone winning 7. For most of Brady's career it looked like it was Peyton, Ben and him and the Patriots dominated the Colts until Manning broke through. Mahomes is going to have to go through: Allen, Jackson, Herbert, Lawrence, Burrows, Watson (if he doesn't get traded) and any of those elite teams that are one QB away.