chris byrd's power

I'm watching a lot of Byrd fights lately. He seems to get a lot of respect from the people he fights. The two Klitchko fights, everytime he starts firing back, they backed off. If he was such a powder puff puncher, why would those two giants back off? I think the impression that he's a weak puncher comes from the fact that he doesn't plant his feet. I've seen him do it many times, very soft punches in flurries, just to score points. But when he plants his feet, I think he has quite respectable power. Same as Ali, his power was not used because he was floating most of the time. When he planted his feet he had more power then people give him credit for. What do you guys think?