one thing he has to be doing is zooming in, but I must admit, it does nothing for me. 
I'm not speaking for him,...but...just sayin...
Hmmm, Zoom may help in a straight HO to gun shot, but it can throw you off leading the target. Hey, ya never know, some people get good at weird things.
A mouse is more precise than a stick. Especially if you disable "Enhanced pointer precision" in Windows. It works the opposite in situations like games. Much smoother with it disabled. There's just too much going on in a stick.
You're only as good as you practice. Not many are going to just jump in the seat and rattle off kills like that.
I don't think he records much.