KojiSan
I just came to remind you that if Lao got a prototype of the airship, then the fire nation should already be using dozens of airships in the war. By the way I noticed a mistake, he spent years studying Chi and fire control. But he doesn't know why the eye in the forehead is necessary for combustion? I think it's a bit strange, he just makes up some nonsense about chi channeling. Although personally I think the sharingan should be able to replace the third eye.