It actually makes sense to use a Rasengan variant. Sasuke's chakra control has improved to the point where it wouldn't require much chakra to make a Rasengan as big as Jiraiya's Giant Rasengan. And if he uses elemental chakra, he could fill the thing with electricity too. Such a Rasen-dori would melt through Itachi with ease, unavoidably in a confined space.Originally Posted by toonice714