The wrestling "double legs" require 90 degree attacking angle while your opponent is in squire stance. But in fighting, this opportunity may be difficult to find when your opponent has forward and backward stance.
There are 3 ways to achieve this.
1. Your opponent gives you that angle.
2. You use footwork to put yourself into that angle.
3. You force your opponent to move into that angle.
This mean that for some technique (such as double legs, inner hook, outer hook, ...), you will need to train in all 3 stuations.
In your training, do you have to
1. Wait for your opponent to give you that opportunity,
2. You move in to obtain that opportunity,
3. You force (bait) your opponent to give you that opportunity?