How did you see them? How is his career and greatness perceived differently if he were to of been given the W?
I don't think he really had many that could have altered things significantly, though getting the decision in the rematch against Chitalada while washed up and after coming out of retirement, would have been a nice addition. Most people that have watched the first fight against Zapata agree he was robbed. It's actually the decisions that coudl have gone the other way that would have likely had most impact, especially if someone wasn't aware of his terrible training habits that saw him retire early in the first place. He was out of shape for both the Torres rematch and the Perez fight late in his reign.Those fights could have gone the other way.
Most lower weight fighters have quick primes. Chang is no exception. I hear Chang had some outside the ring issues. Once he lost his conditioning, timing and speed it was over for him. Chang was never a puncher, and stood about 5'1 or so.
Not only should he have gotten the decision v. Zapata, but he also had a significant foot injury--the type of injury that would have guaranteed the fight being postponed had he--not Zapata--been the champion. If Chang gets the decision there, as he should've, and he doesn't come back after the last Ohashi fight, he retires undefeated after maybe 18-19 defenses. This could have easily happened, as it was only financial exigency that forced him to return. And if that happens, then I think he would actually not be so under-rated in the West--because the casual observer only looks at won-lost record.