There are stories that say otherwise (ref. Muso Gonnosuke).
That was a training bout, by all accounts, and not a duel. I will grant that my info could be wrong - I am an amatuer scholar of these things at best, a dilletant at worst.
As far as I am aware, there is no record of the second bout, when Gonnosuke returned and used the jo againt him. SMR lore indicates he won that match, but SMR is biased in Gonnosuke's favor, for obvious reasons.