Saying Naruto learned the technique faster than Minato is pointless. Do you know why? Because Minato invented the rasengan, so i'm sure he had to work out the bugs all by himself.
As for Naruto learning the RasenShuriken, this was impressive and it did make Kakashi feel like it was time to pass the tourch. But if you notice, Naruto has the fox eyes whenever he does that jutsu, except that his eyes are still blue.
Naruto did beat Jiraya in learning the Sage mode technique, im not gonna argue there, im not gonna say he surpassed jiraya though. Even though Jiraya was killed by pain, Nagato said himself that if he didn't have his 'Six paths of Pain' secret, he would have probably lost.
Naruto would not beat the Kages without his Nine Tails Chakra. The Raikage would have taken him out easily had he not had Kyuubi mode, and Naruto certainly would not stand a chance in hell at beating sasuke if Kurama was not there to aid him.
Saying Naruto is a boss without Kyuubi, is somewhat true, but lets not get crazy.