you want my honest opinion? They stop at 1. two words--preta path; yata mirror; totsuka blade. Not to mention the hella assistance Nagato would be getting, watching his back while he went around absorbing everyone's susanoo. Shit, Obito with all bijuu should merk easily. Kamui would be useful too. And if he has the six paths it's gameover. This is EMS Sasuke, not Rinn. This is EMS Madz, not Juubi or Rinn. And then there's Indra...
But if you think they get past that, they stop at three. (I still believe FTG can teleport away a chakra cloak such as PS) BM >= PS. BSM >> PS
But if you think they get past that, they stop at six. SS merks a PS without kurama no doubt
But if you don't accept those and want a serious answer, if somehow the three manage to truck on, they absolutely do not get past eight.
with Tobirama and Minato providing FTG assistance around the map and Minato's space-time barriers and seals, it'll be all too easy for SM Hashi to SS the three of them. Hashi's wood absorbs their chakra.
plus they have their ace in the hole. Two words--prime hiruzen
