Board Thread:Boruto Discussions/@comment-28341973-20160827204918/@comment-25122992-20160828173710

The problem is that Naruto can't extract Kurama from himself and transfer it to someone else without dying from it. And since Naruto isn't proficient enough with fuinjutsu to split Kurama into halves as Minato did, he must remain the host of the entire Kurama for the rest of his life. However, I agree that it'd be kinda cool to see Boruto with FGT, it fits his name and at least adds a new FGT user to the classic ones (Tobirama/Minato).

Back to the topic, I don't know what kind of power Kawaki can possess, but I doubt he could've taken on Naruto/Sasuke/Sakura as adults all on his own. Even Kaguya, the progenitor of chakra, struggled against their teenage versions, so I'm not sure if Kawaki defeated them in a fair battle or if there was some kind of battle at all.