By Jennifer Piacenti With Sean Payton reportedly retiring, the Saints’ offense will look different next season. That changes the team’s fantasy outlook. In a bombshell development, Sean Peyton reportedly informed the Saints he is stepping away. And as much as Cowboys fans may hope he could be Mike McCarthy’s replacement, rumor has it he is going to join Drew Brees – and maybe Tom Brady- in retirement. OK, I was just kidding about Brady. Does anybody really believe he is retiring after an MVP-caliber season that took him into the postseason? But, I digress… Payton leaves New Orleans as the wi…