Okay this has nothing to do with Dragonball Kai but I do want to talk about this part of the franchise.

Everyone knows how useless Yamcha is, he couldn't beat a Saibaman, outclassed by pretty much every fighter in the franchise, even when he does get screentime it pretty much ridicules him.
But a "What if" manga story puts Yamcha on center stage as he not only prevents his own death but completely changes history in the Dragonballz universe up to the end of the Cell Games.
This happens when a boy dies in the real world and gets reincarnated as Yamcha, but since he retained memories of the events of the whole of Dragonballz he sets about changing history by turning Yamcha onto a different path, agreeing to train with Roshi, preventing his own death and even going to Namek to have his potential unlocked.
It's a bizarre manga but it gives some sympathy to a character who is otherwise dead weight among a group of planet destroyers.