Seriously not one actual answer in that video.
Answer to what? The video is Steve Tuck sharing his perspective on the strain.
Tuck says he's heard all kinds of stories as to the true genetic lineage of OG Kush, and since he doesn't know for sure what the truth is, he's not going to spread these rumors.
Maybe that's not the answer you wanted to hear, but in my opinion, his response is a lot more mature and intellectually honest than a lot of people in the cannabis world have on topics like this. If you want to believe that this came from some random seed found in a bag from a Grateful dead concert, go ahead.
Other useful factoids in the video?
a. He believes the development of "OG Kush" is associated with the defunct Overgrow.com
b. The strain tends to hermie.
c. Yields are typically low, but can be improved with excellent growing technique.
d. Flowering time can be highly variable depending on growing conditions.
e. Although true breeding, this strain is usually propagated by cuttings, not seeds. (Incidentally, I'm not sure his claim about this one being true breeding is correct).
On the original thread question, "how many OGs"?
The answer is that by definition there can be only one 'original' OG Kush because at one point someone gave that name to a particular line. If you have a clone of that line or a linear descendent, you have "OG kush" and if not, you don't. But that said, the true histories here are a little murky, and there are probably any number of genetically similar lines out there derived either directly from the original, or from a similar genetic background.
If you look at what's actually sitting in the jars at CA dispensaries, there are at least twenty different buds called OG this or that: OG Kush, Skywalker OG, Platinum OG, Larry OG, Fire OG, Sour OG, Alien OG, Diablo OG, Abusive OG, Diamond OG, Master OG, Presidential OG, Rascal OG, Ghost OG, SFV OG, just to name a few.
One strain is called "Herijuana OG" and Tuck must really get a kick of that, given that his herijuana strain has nothing whatsoever to do with these other ones.
How different are these things really? I've got to believe that many of these are basically the same thing with different names, and at least many more are just inbred phenos of the above and more similar than different.
In my mind, the question isn't "how many OGs are there", or even "which one is the 'REAL' OG", but rather "Of the many lines that people are calling OG, which ones are worth growing and smoking and why"?