1 hour ago, AK_Aramis said:Plus, given the setting, some kami will eventually tell some shugenja, who will tell the DaimyĆ, who will order his capture and/or death. If captured, he'll be compelled to teach it to the samurai, who will then develop counters to it...
Or the void kami might inspire some monk, who them goes and learns it, and then passes it on to the samurai, just to keep the natural order.
Recall that testimony by spirits is inadmissible, though that only implicates the former example. In the latter, if the monk actually learns it himself, then he's good to give testimony about it.
On the other hand, if it's actually a peasant, then there won't necessarily need to be any testimony taken, and they can proceed with however they want.