As far as I know a 12-6 elbow means your arm is vertical and your fist is up in the air. I don't think this would be considered a 12-6 elbow (correct me please).
Luckily there's a gif of Jones doing what I think is a 12-6 elbow.
This man is correct, give him a cookie.
"I tried to punch him, and he literally moved his head out of the way and looked at me like I was stupid for doing It"
- Forest Griffin
NPFFL: Alistair Overeem, Fedor Emelianenko, Shane Carwin, Chris Leben