Just a quickie question since he mastered biju mode, befriended Kurama could he perform it like he did when facing Sasuke in part 1, under the influence of Kyubi
To be honest it's not really one handed Naruto just doesn't have the Chakra control, Kurama's chakra arm helps him create them now so he doesn't really need the use of Kage Bunshin, so I guess you could say it's one handed.
It would be cool to finally see him use it with no clone!!! It would be. Like instant death for an opponent! Xd except for that bastard kabuto during that sannin fight
Well considering him and kurama being friends now, he has more control over his own chakra. So now he can, but a habbit usually die hard. I don't know if he will still use a chakra arm or a clone, but I know he can form a one handed rasengan now