I believe that if you are concerned with street-effective self defense, you need to have a clue about grappling, period and end of story.
i don't know if anybody would agree but sir combat on the street won't, in most of the case, involve grappling. when you let yourself grapple an opponent on the ground you've put yourself on a vulnerable position and as much as combat on the street is concerned your dead. ofcors, i'm not trying to get you irritated or something sir. and I have to add sir Aikido is very good in handling multiple opponents.