Minato can also summon toads as well...nothing stops him from doing so.....Minato would be too fast for Nagato..he doesn't have the other Pains so his field of vision is limited...either way I don't see nagato reacting fast enough to KCM Minato
Naruto would doge Amaterasu...he is more than fast enough to do so..if naruto merges with ma and pa, then frog call would paralyze sasuke...even asides that, the second Gamabunta joins Naruto's side, ma, pa and bunta can combine and use goemon which would give sasuke problems
Tobirama should be able to hold his ground before these 2 are done...it's not like Madara would blitz him considering Tobirama's high level speed ..he can also use ET anyways since it's unrestricted ..what's SS?