@Sigilbreaker26
“There are no secret moves anymore”
Uh, if you’re talking about real life, that’s correct. But this is a fictional setting with tons of secret moves. Setting aside Ohma’s Niko Style, Setsuna’s Koei Style, and even Gensai’s Kaiwan Style which, while being more mundane than the two of them, still incorporates parts of the Niko Style into it like the bone binding technique, just recently we had Toa introduced with his unnamed Kiwi Style. Then there’s the freaking Kure Clan with their Kure techniques, Nikaido’s Heavenly Wolf techniques, Inaba and Rei’s assassination styles, hell, even Sekibayashi’s wrestling style of causing damage to his opponents as they attack him can be considered a personally refined technique.
What Yumigahama did is the same as what Setsuna did to his master; Setsuna cozied up to Genzan, then used the techniques he learned to kill him and ran away with them for his personal motives. Guys like Genzan and Rei’s grandpa passed down their techniques because they wanted to continue the legacies of their respective martial art styles. With these sorts of ancient styles, there’s a tendency to treat the histories of the styles with respect and reverence for their predecessors in developing and continuing the lineage. Then you have guys like Setsuna and Yumigahama who take what they can get before fucking off, wasting the time of their teachers and disrespecting the style as a whole. Kiozan was an outcast for deviating from the standards of modern sumo, remember? Martial artists in these kinds of settings put a lot of sentiment and respect for the styles they practice, and that was pretty much the essence of the fight between Seki and Kiozan.
Guys like Agito who can learn a style to a high level of mastery just from observation are treated like super prodigies. Sure, one can be self-taught, but you can just see how Setsuna’s training with Genzan as a kid as an example of how hard it is to learn a “secret technique” even with instructions from a master, and he was a prodigy too.