Neji is obviously really good at chakra but so was Sakura and most medical ninja including Tsunade, yet Tsunade herself said that only JIraiya and the Fourth could perform the jutsu when she met Naruto.

In terms of concentration it couldn't be more difficult than trying to control lightning as with the chidori, or genjutsu which requires the user to not only have complete control over their own chakra but their opponents as well..

Yeah, I know the handseals were a shortcut but I seem to remember both Kakashi and Sasuke using the chidori without forming seals.

Quote Originally Posted by XanBcoo
Naruto is the main character. He can do anything by trying hard enough, it's as simple as that.
I suppose we could just all go with that and forget this whole discussion but where is the fun in that. Projectile Rasengans will never happen that goes against the entire principal of the rasengan and the need for direct contact. Besides if you did that then Naruto really wouldn’t have to do anything now would he.