My father could not do one pull up, one push up, or one push up. He don't have the strength and the muscles to do that. So he developed a guard in a very all-you-grace style which doesn't belong to Japan at all. The Brazilian Jujitsu becomes more like effective in the Valitudo and the No-Hods bar with GI without GI. And it's another very important element is he was so light and so small, he could not ever fight on top,. mount positions, passing guards, and kick ass from the top.