Board Thread:Boruto Discussions/@comment-33255203-20171004210031/@comment-6769189-20171026193005

Toneri having Hanabi's eyes are circumstantial. He took her eyes so that he could have Hinata as a bride. Hinata has pure eyes simply by being part of the Hyugas main house.

And what do you not get about a temporary transfer? Obito did it. Chakra absorbing characters do it. It was a non-infusing transfer because Hamura wanted it that way. Hagoromo did it when he spread chakra throughout all of humanity but he did not spead 6 Paths chakra or any of his abilities. There is an entire page on this wiki dedicated to different instances of chakra transfers and their effects.