I like that theory, here is another that I find interesting, and that seems to make a lot of sense.
It (The Sai) is known to have been used in other parts of Asia before its use in Okinawa, most likely stemming from Indonesia. In Malay the sai is known as a chabang, meaning branch, and is thought to derive from the Indian trident. The chabang spread through of Indo-China, and south Asia through trade, and may have reached Okinawa from one or more of these places. In China it might have been known as the SanKuChu. despite all the theory's however, it will always be most associated with the Okinawan culture.
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