The first guy is an olympic lifter

The third guy also....just judging by the shoes.

The second guy looks to be a powerlifter, but even some of them have some insane verticals.

LMfao those verticals are insane lol i better start working harder on my dead lift

yo,the stretches there are BS
If you want higher vertical you shouldn't do static stretches before the training,only after.
Before you should do dynamic 2 second stretches.
Search stretchexpert on youtube,the guy is like 50 years old and can do a tomahawk dunk

U stretch for flexibility not for a 2 second jolt down your leg lol that guys is very intelligent and knows alot about vertical jump but i would have to disagree with his stretching method. nice sig though!