Well, you did make the assertion. Doesn't seem to be correct, though.
Which, once again, contradicts your claim that it didn't exist. If it didn't exist, it would be deemed non-existent.
The Shotokan mechanics of the Mawashi Geri/roundhouse kick did not exist as part of their system. The actual concept of a roundhouse kick in any fashion was not unheard of, but it was deemed radical and thus rejected. Especially roundhouse kicks to the head (!).
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