Board Thread:Episode Discussions/@comment-24855929-20160616114031/@comment-26369387-20160622232956

Except you did, by impling incorrectly that reason Uzumaki clan has spiral as clan symbol is because of Indra's Mangekyō-design, when in fact the most likely reason is the whirlpools surrounding the Uzushiogakure.

Indra's spiral Mangekyō, on the other hand, is most likely related to Hagoromo's Rinnegan, since it was shown when Asura and Indra were introduced first time and Indra was said to inherit Hagoromo's "eyes".