Risk reduction and the Outer Clinch
Clinching like a wrestler is a great way to set up a takedown, but it requires risk. In competition, risk is ok because the bolder fighter often wins. In a street fight it's different because the stakes can be life and death. Animals in the wild, predators and prey, usually try not to take risks they don't have to. That's because injury in the wild often means death. Humans need to think the same way when fighting for their lives.
The advantage of having an Outer Clinch game is that you can greatly reduce risk. Most 2-on-1 controls allow you to " take the outside gate. " Taking the outside is a Wing Chun term that means controlling an arm from the outside so that the Badguy can't punch you with his captured arm. The Badguy can strike with his free arm but he has to move around his captured arm to do it. More importantly, if you truly control the captured arm you can apply leverage on that arm which will make it very hard for the Badguy to strike full power and will also force the Badguy to defend his arm from being possibly broken.
Weapon disarms and the Outer Clinch
Also, if you can capture the fighting arm it reduces risk of being effectively attacked with a weapon. Yes, the Badguy can still draw with his weaker hand but I'd take that any day over having him in double underhooks and not being able to see his hands.
Also, almost every functional weapon disarm, of any martial arts style, involves some variation of the 2-on-1, even if they are not named as such, in that they use arm controls, wrist locks, etc. Having a good Outer Clinch leads to having a good 2-on-1 and having a good 2-on-1 leads to good disarms.
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