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Basically everything known about Tanaka comes from the man himself, and even with that in mind, the article is woefully scant of citations. He's certainly not considered by the martial arts community to be exactly what he portrays himself as, with his entitlement to most of the positions he claims more-or-less universally doubted, and there being virtually no source for the alleged history of his own art(s) save Tanaka himself. There's no real way to indicate this in the article, given it's mainly discussion amongst eminent practitioners in online venues (he features in no literature save his own, certainly none offering an in-depth critique), but the fact that the statements included in the article lack even citations from Tanaka's own writings doesn't exactly help.