Board Thread:Naruto Discussions/@comment-3568954-20140809171212/@comment-5909893-20140809211234

If that were true, then anyone could make an elemental Rasengan. The reason the Rasengan is hard to be combined with an elemental transformation is because the Rasengan is already the finest form of Shape Transformation, so combining a refined ball of pure chakra with elemental chakra would probably be very hard. In reality, too, I think the Kirin-Rasenshuriken wouldn't really do much because Kaguya (like JOA20 said) has complete control over nature. She also posseses the Rinnegan, so she could probably absorb it or something.