That depends. If you can do 2-on-1 in such a way that their structure is completely broken, then you have 2 legs and they have nothing. For example, if you can get a wristlock to roll their shoulder over, something like these*:
I wish I could find better pictures (as I've said before, my google-fu sucks). The first one is a little exaggerated, and mine isn't at the right angle to show what I'm talking about properly. But anyway...
If you get a wristlock like this, you have 2 free legs and 0 free hands. Your opponent has:
- One arm in the lock
- One arm with his body between you, and the lock preventing much shoulder movement
- One leg away from you
- One leg with his weight on it towards you (which means he can't kick)
From this position, in order to regain a neutral footing, he will need to both get his weight centered and break free of the grip before he can do much. Whereas you can kick, or transition to a better grip for a throw.
A lot of our techniques try and do things like this. If I put 2 hands on 1 of your hands, I'm trying to do so from a position where you can't use your other hand.