...and he displayed his poll plaques because he liked good wood...
To tell a good story that people want to hear.
It's not complicated, really.
I think you've covered all the bases, what else is there?
Seriously, if you're going to live in a world of myths created by other people, why the hell not make your own for yourself?
In the end, play the records, they're all historical now, and they straighten themselves out (in accordance to whatever mythology one brings to them, of course).