My best friend was my shadchan. I am happily married b”H 34 yrs. My next door neighbor’s son was my son’s shadchan. My daughter’s shadchan was a relative who happened to be a professional shadchan.
As far as I’m concerned, it doesn’t matter who the shliach is. Either one could be the right one. You have to check refrences no matter who the shadchan is.