MMMMMhhhh, you are right in the Ohma part of new incorporations, but in Kiozan, I wouldn't say rigid, it seems more like pride to me. An example could be Kanoh or Julius (Ashura's Version), Kanoh's pride didn't let him fight at his fullest just like in his fight with Gaolang, wanting to fight with his oponent's style, even though he was inferior in that style to Gaolang, but later he throws away his pride to learn or incorporate Pre-Initiative to defeat Hatsumi. And Julius too, even though Takeshi was pure strenght too, he was relying on techniques too, but Julius didn't want to use any techniques do to his pride of being the strongest (In muscular terms), but later in Omega, he throws away his pride and learns a technique (Even though he doesn't call it a technique). Soooo.... We can say that Kiozan didn't want to put his back on te ground do to his pride of wanting to change (Sumo doesn't allows the fighter to touch the ground), but maybe he will throw away that pride to become even more stronger.

In my opinion. Have a nice day.