question..i just watched it again and im wondering why hiruko couldnt absorb naruto's rasen shurikken.i mean he absorbed 4 kekkei genkai's and was about to absorb kakashi's.he shown that he can absorb all ninja jutsu so what makes rasen shurikken any different.input please.
your highly mistaken.ftg jutsu does not harm the person who uses it.if that was the case minato wouldnt use it.minato would never have used it to teleport kushina and baby naruto back home so he could go fight.that was the other persons space time ninjutsu that was used mainly to teleport...
anybody can learn rasengan.it is not a kekkei genkai.its just shape manipulation and having good chakra control.its your choice to add your element but it will be hard to do that.