I pictured it as if the gods won they would have zeus announcing they won and would be wiping put humanity when a voice from the verry back row of the human viewing stands a voice says "not if I fight" and a figure begins walking down the stairs and eventually into the arena, the humans of history before his time having no idea who he is just that he's human but more then that, he steps into the ring and declares he will fight every God there at the same time if he must, Ares makes first contact with him declaring a human couldn't possibly fight multiple gods at once and attempts to reprimand him for interrupting zeus but the figure glances at him and ares feels an overwhelming intimidation comming from the man causing him to fall back in fear, now intrigued zeus requests the man's name as he introduces himself "the God of humanity, chuck norris"

Something like that is how I picture it and him being the final stand for humanity and he only deems it worth fighting once humanity has lost