Agreed.Sannin with high difficulty.
J-Man took out 3 that's not to say Tsunade or Oro is capable of taking out 3 also. The Sannin's power aren't equal just close.sannins with ease. J-man took out three by himself. So by that logic they should at least take out nine (three each).
I believe what Nagato meant by that was if J-man knew he was stuck in a machine where he controls the bodies from he wouldn't win. J-man would have found him and killed him.....The Sannin have no counter for Chibaku Tensei.Sannins easly J-man was able to handle 3 of them him self and as Pain said if he knew the secret behind them he would of defeated all of them, then put Tsun and Oro to the team you know my friend, have over kill o.o