Radditz would be a fun character to put in, but he doesn't have any attacks named in the 4 episodes he's in and doesn't transfom at all. The attacks in Dragon Ball Z Budokai were made because he needed attacks for the game. Also, he DIES after the 4th episode. Sure if he was alive he would be stronger but he's not alive ok. I just don't think it wuld be a good idea to put a character in that was gone in 4 episodes. Krillin is there, even thoug he is week, because he is in the show to the end.