So he shows up to coach…do the Saints fire the current coach. Or does Payton tell the current coach to get out of his office and have a seat in the corner? If the Saints play hard ball Payton could make a poop show in NO.
Doesn't work like that. Remember, the Saints are still paying him right now even though he's "retired" as coaches' contracts are guaranteed. So it's not like the Saints are in breach of contract or in some kind of holding pattern.
If Payton were to just show up to the facility to resume coaching without the Saints' prior approval, he'd likely be kindly asked to leave the premises. Gently, very gently at first, given his status with the franchise. But he can't just show up unannounced, make a stink, and force his way back on the Saints' sideline. Would not happen, will not happen. He pushes it that hard, the logical conclusion is that he's carted off by local deputies. But like I said, it's a hard immutable fact that it won't happen.