Board Thread:Theories and Speculation/@comment-26388300-20160325102110/@comment-734582-20160411213127

AsianReaper wrote: Makes me wonder why Minato even bothered creating the Rasengan, when he could have just learned some other jutsu to the point of using one or no handseals to create it. Even Kakashi can use Raikiri without hand seals at this point. Because Chidori/Raikiri is a dead end. It's as strong as it can be. Sasuke added some useful aspects to it like Chidori Blade or Senbon or Current. Kakashi channeled it through a Kunai.

Rasengan on the other hand is as powerful as Chidori, and that's just the base jutsu. Rasenshuriken is what happens when you add an element to it. As Naruto showed, even combined elements can be added to it. And as Naruto further showed, even a Bijudama can be added to the core.

Rasengan is a much more versatile jutsu that can do whatever it needs to do.