yeah pretty muchI don't see Chou Shinra Tensei being so useful off the bat. He'll have to deactivate every other body first, making him the sole target of importance. With Full knowledge, attempting to use CST or Chibaku Tensei will just get him Ameterasu'd or Susano'o'd with this distance.
SM Naruto is actually more of a problem than KN6 Naruto, considering that MS controls the Kyuubi. But I'm of the opinion that Yata's Mirror can essentially negate FRS, and after that he won't have that much Sage chakra left. Of course, this is assuming that Naruto starts off in Sage Mode, as otherwise, he may be destroyed far before that.
Then there's the entire point of genjutsu, which has solo'd Naruto even with knowledge. Itachi should easily be able to genjutsu him now. Sasuke could do the same.
Again, in making a team that doesn't need prep, The Uchiha bros are one of the most Hax teams in existence because they work well together and can defend for each other while the other attacks (Minato + Itachi + prep is the best team though). Naruto and Pein have far too big attacks, and may easily get in each other's way. It's incredibly likely that they may end up killing each other. They're powerful, but they're not a good team.