Naruto Shippuuden Episode 49

[KrayZ33]

episode 133 and actually sasuke was losing the fight until he realesed the seal to the second stage and after that he was totally exhausted... he wasn't really superior..

and its not like a rasengan more or not does hurt naruto... when he was training the rasengan he made hundreds of it so its not that important, i mean you don't blame yamato for using this ultra-ninjutsu which probably consumed more chakra than the rasengan does.

well on the other hand we don't know how much chakra is consumed by these technique, but it doesn't bother naruto at all so when he is out of kunais or shurriken he could also throw with rasengans... i can't find a difference in his case. it doesn't seem to be something like chidori even though it has nearly the same power