Sour Diesel Geneology

so i have this sour diesel growing in my stealth cab, and i just started wondering where sour diesel comes from. so i googled "what strains make sour diesel" and i came up with this geneology map, or family tree so to speak. but the question is...is this correct? and if so what is the uknown sativa that you get 91 chemdawg from, and what is it crossed with? and also the afghani's origins are confusing, i read that some of the afghanis are mixed with multiple strains of afghani. how does that break down?

http://www.cannabisculture.com/articles/4651.html This article might help clear it up for you.

Thanks, some good info, but it basically just says that its a mystery lol

This is the most accurate thing you will find on sour diesel.

http://en.seedfinder.eu/strain-info/Sour_Diesel/Unknown_or_Legendary/