If he wanted to do something like that, he could just hold out the Rasenshuriken and use it to shred any incoming attacks. In any case, something along those lines won't even be able to compete with the defense granted by the Kyūbi Cloak he already has.
Plus, we've already seen enough variations of the Rasengan. Enough is enough.Yet so many people complain when other characters jutsu get brain stormed
Hell no, its a stupid idea and a rip off of Obito's little move. Also a rip off of sasuke's amaterasu rib cage. His defense is already amazing, there is no need. Too many Rasen's....stahp...He went through so much struggle trying to make rasengan round now u want it to be flat?