I still have to say Edo Nagato and Itachi, there is a reason that Kishi had to break them up as a tag team, too intense :/
Imagine if Itachi and Nagato were to attack the fodder Allied Shinobi Forces. I wonder if the Allied Shinobi Forces could hold their own or not. Probably not.U_U
OT: Being Edo means unlimited chakra so outlasting them is not an option. For this reason Edo Itachi is much more powerful than alive Itachi and Itachi doesn't have any drawbacks. The same goes for Nagato but Nagato when he was alive already had a huge amount of chakra.
MS Sasuke tied with Danzo and I have no doubt Itachi would manhandle Danzo with izanami which would stop izanagi. Edo Nagato can defeat Jiraiya and Hiruzen at the same time because it took Naruto, Bee and Itachi to defeat Edo Nagato who was being controlled.
Overall team 1 low-mid difficulty. Next time don't make a team filled with Edos.