Board Thread:Naruto Discussions/@comment-24142271-20140821115700/@comment-1018594-20140821135904

By that logic, he should be able to use Dust Release as well. I don't think it has to do with him absorbing chakra from attacks using Kekkei Genkai, but his Rinnegan probably allowed him to mix Water and Lightning Release to use Storm Release, or something like that.