A few things:
No, John didn't have ANY choke at all, what he had ( at best) was head lock of sorts.
There is, like Frost said, no way to choke someone when they have you mounted that way.
Yes, there are some chokes that can work from being mounted that require a collar of sorts BUT even those are easily countered by the guy on top IF he has any grappling experience at all.
They are low percentage chokes at best.
The whole drama was a black eye on Bullshido and on John.
It did expose that he had very little "anti-grappling" experience.
Don't know where he is now or what he is up to since he kind of turned on everyone that thought that his behaviour in this was unbecoming ( including myself).
Psalms 144:1
Praise be my Lord my Rock,
He trains my hands for war, my fingers for battle !