Robert Comsol wrote:
All the data the Excalibans had about Kahless came form Kirk and Spock's memories. Not exactly unbiased sources.
Correct. Then it was Federation propaganda at the expense of the Klingons?
Exactly. That wasn't the real Kahless, that was how the crew of the Enterprise
imagined Kahless, based on their own experiences with Klingons and what little they knew (or thought they knew) of Klingon history.
I imagine the clone on DS9 was closer to the real thing.