Originally Posted by jekyl_hyde
Maybe the reason Minato was brought back was for us to finally see "THAT" jutsu.... duh-duh-duhhhhhhhhhhhhhhhhhhhhhhhhhhhh!
I don't see anything else but naruto finally combining his and kyuubi chakra to be used in tandem as that jutsu minato wanted him to perfect. And we already seen this done without minato coming back to help. But i agree with Numi, he was brought back to confirm the kyuubi incident.