Ken introduced granddaddy purp to the prop 215 collective system in the early-mid 00’s, that was the first time patients got access to the genetics, and from there it spread and became popular.
It’s an old black market line, no one knows who bred it, and because it was from that era no one could take credit anyway.
Ken sure had a heck of a story though. People love a good story. Doesn’t make it true. He also gave false genetics sometimes, it’s definitely not urkle x big bud. That just made it easier to market at the time.
As far as I’m concerned, it’s just a classic east bay strain.