wrestling is no good against multiple opponents, and on the street (and especially shtf) there are almost always multiple opponents. you can't tie yourself up with someone, and even more so on the ground (!), in these situations. you have to hit and move and repeat.  knowing some wrestling is good, to give you time to draw your knife or gun or poison powders (whatever) and escape. kali/escrima and others i won't mention.
Gadsden