Board Thread:Theories and Speculation/@comment-34661853-20181218233634/@comment-32685487-20181219110821

Obito said that he could NOT use both the Rinnegan eyes and you need both of the eyes to use their full abilities and power.. Nagato used both when he was a kid. Hanabi doesn't have the body to use the Tenseigan properly therefor if she could use it, it would probably be a last resort thing that would drain her of all chakra and strain the hell out of her eyes.