Re: Naruto Manga Chapter 520 Predictions and 519 Discussions
I thought this chapter was excellent. (And not just because a personal theory of mine on the subject of Edo Tensei was proved to be correct, but that helped.

)
For all those who feel disappointed that Naruto will be learning
another form of Rasengan, allow me to offer the point: Rasengan is an
underdeveloped jutsu. All it is, in its base form, is chakra physically compressed and rotated. It takes great levels of skill to master, and it's both powerful and efficient (not much chakra is actually required) but it's still little more than a foundation. One of the things Kakashi impressed upon Naruto during elemental training was that the Fourth, had he not died, would have experimented, played around with, and vastly improved Rasengan.
This is now Naruto's responsibility. At first it was a case of simply increasing the size - Oodama Rasengan - but that's basic, and everyone knew it. Sage Tech Giant Rasengan was born of that, but it's still only a case of quantity, when quantity
and quality is needed. From that realisation came the Wind Rasengan and Rasenshuriken: one versatile (used in combination with Yamato's Suiton) and the other obscenely powerful, a trump card technique which is probably about as close as any regular human will get to the Tailed Beast Bomb. And now we have Naruto's very own Talied Beast Bomb, built using, again, Rasengan.
Does everyone see my point? Rasengan is supremely versatile, a jutsu specifically
designed to form the basis of better moves. There's more than enough potential there, limited only by your imagination: long-range moves, short-range moves, elementals, bombs, kekkei genkais, combination jutsus . . . that's just the list off the top of my head. Impregnate the rotation with different forms of chakra and
stand back. Sure, Naruto could learn Danzo's Fuuton: Vacuum Serial Waves, or Wind Kunai Blade, but how useful would they be? They are sorely weakened compared to what Naruto already has. So much better to pour that time and effort into building
on an already-superpowered foundation.
If Naruto's mastery of the Rasengan allows him to develop a Menacing Ball
that you can hold in the palm of your hand, sign me up for a ringside seat. Sasuke will cry like a child.