By Cameron Flynn Former Saints head coach Sean Payton shared his thoughts on the firing of Matt Rhule Monday on “The Herd with Colin Cowherd.” As the coach in New Orleans for 15 years, Payton went up against the Rhule-led Panthers for his final two NFL seasons before retirement. During the sit-down with Cowherd, Payton discussed not only the decision to let go of Rhule midseason, but also the harsh realities that come with being an NFL head coach and turning around a franchise. “It’s almost a unicorn — the open job with a great QB, waiting for you to come in and be the foster parent,” Payton s…