Board Thread:Theories and Speculation/@comment-32457608-20170823143115/@comment-734582-20170826080920

The rasengan is literally a "spiralling sphere". The Uzumaki clan has a spiral as a symbol. The rasengan is thus an Uzumaki clan jutsu.

Except it's not.

Izuna uchiha has a circle as part of his MS pattern, the same symbol Sakura has on her back. Sakura is secretly Izuna.

Except she's not.

Naruto has Tomoe on his collar, same as the Tomoe on the Sharingan. Naruto is a secret Uchiha.

Except he's not.

Kakashi has white hair. TTJ Madara has white hair. Kakashi is secretly a TTJ.

Except he's not.

Vague relations, common symbols, it's not proof of anything.