Originally Posted by ask me anything
LOL KYF beat me to it
Just one thing I'll add. It seems a persons primary chakra type is easier to use and train with then there secondary type. Sasuke learned fireball jutsu in a couple of weeks of training without any training or SG to copy with. IMO, if he had SG and a good teacher he could have learned it in a day. Yet It took him a full month to learn chidori with both SG and the creator
of chidori to teach him. Had he been a natural Raiton user it shouldn't have taken that long.
Another thing is it took naruto a week to learn rasengan and it took sasuke a full month to learn chidori. Why would that be if they are both about the same in strength. It's not like sasuke wasn't training as hard as naruto. IMO it's because Sasuke had a disadvantage training with his secondary
The reason why it took Naruto a shorter time to learn Rasengan is because it has no affinity attached to it, it's just pure chakra molded into a tight ball using shape manipulation. Hence the reason why he had to figure out his natural affinity so that he could apply it to his Rasengan.