I looked back, and I didn't see where the OP mentioned 4 BGs. Here's where the number four came from:
(I took the liberty of making the number 4 bold)
Originally Posted by George PT-111
I have talked to at least 4 people who were recently mugged near their appartments by one or multiple individuals.
He is talking about four people he talked to, not four assailants. He makes mention of "multiple individuals", when referring to the muggers, but never mentions a specific number. I have looked at all of his posts, and could not find him referencing 4 BGs. I tried to be thorough, but if I've missed a post, let me know.
EDIT: Alright, found the post, he says "one of his friends" was mugged by four BGs, but not every mugging.