This wasn't about Naruto Vs Sasuke.It was whether Sasuke AND MADARA can learn Rasengan and Rasenshuriken.Funny how you ignore MADARA and decide to attack Sasuke.Looks like you're sensitive about Sasuke.
Sasuke can use PS with ease yet he doesn't have enough chakra do RS?What is RS? Rasengan with Wind Element added to it.Chidori was made based off the Rasengan.Kakashi couldn't add his Lightning Element to his Rasengan so he made Chidori.
Rasengan is made from chakra,no element added,Chidori already mixes chakra with an element,lightning. Rasengan is chakra with an element,wind.
Sasuke has the Rinnegan which allows the user to use and master all the basic nature elements. Sasuke already has most of the process of RS understood via Chidori,which is chakra with nature element added.
So what he would need to do is add wind element to it,which shouldn't take long considering he's a genuis,has seen Naruto use it many times,and was easily able to adapt his Enton to perfectly match the chakra output of Rasengan,in seconds while he was running in battle.
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Madara could learn it to since he has the Rinnegan to be able to use the Wind Element,but Sasuke will more likely be able to master it faster considering his expereinces with mastering the Chidori and seeing Naruto use Rasengan and RS alot.
I already know he didn't copy it.Read around the thread.I'm not going to type the same thing to different people.Read whay i said to Darth on the prevoius page.