I've always found most Chinese history to be difficult to follow, though granted the only era I've ever read about was the Three Kingdoms Era. All the written records at the time seem to almost all be state sponsored by whatever warlord/king/minister of the region the scholar writing them resided in, and tend to have a way of always seriously sucking up to their benefactors in all their writings, making it thoroughly difficult to get an even relatively unbiased record of events. To add to it is the way Chinese scholars of the time seem to have ended up blending myth and legend with fact to make it almost impossible to tell what's really happening. I can understand extolling the martial prowess of your nations heroes, but saying they have near supernatural strength and speed is just kind of ridiculous.