I've had more street fights than I care to think about, and unless you want to get jumped by more people you can count the golden rule back then was don't ever willingly take anything to the ground.
As I said before, if you get taken down you need good ground game. I got some of that from Silat, the rest I improvise. (Bare in mind it was very, very rare I would be up against anyone with any formal combat training)
Subsequent of these confrontations I found that if someone lays hands on you, tries to punch you (mainly sucker) and or knife you the quickest most direct defence for this is best. Then run your backside off as a gaggle of said attackers mates would be baring down on you.
If you try any close quarters control stuff (i.e. locks, take downs, submission work) in an inner city street fight you are going to have someone come up behind you and put a blade in you. Chances are you wouldn't of even known they were there.
I've lost a couple of friends to street fights, mainly because they tried to fight instead of just getting their attacker away from them and running away.
You said you were in a profession that involved you street fighting. Though this means your responses were bound by the law.
When your a 16 year old and you have 10 - 15 people wanting to stomp your head in, you do what you must.