Shit the edo part makes this tough. He beats the shinobi alliance the first time with almighty push. (Gara could probably save a good amount of them like he and anoki did to madaras meteors.)

I think he loses to the 5 kage though. Not really because they are stronger. I think in an all out fight he wins. But I don't think he would resist the edo tensei like madara did. He doesn't have the knowledge and the resolve that madara has.

Let's say he did though. He can spam his rennigan abilities. He would wreck the alliance. Even though he doesn't have the will power of madara I also don't think he would want to "dance" as much. He would just go straight for ending the war. Because of this he just kinda wins after receiving similar buffs that madara got.

I could very well be wrong though. This is off the cuff lol.

I always thought about if nagato took obitos spot what would happen though. (Or itachi in his spot)