Hello Chad_York!
Not sure you'll find a consensus here but lots of varying speculation
BUT, since you asked, I'll jump in a give you mine.
I am absolutely convinced that BG is local to the area, perhaps not Delphi proper but local and has "connections" to individuals there either family and/or "associates." BG grew up around the bridge and knew exactly how to get around quickly, over the bridge, through the creek and knew the lay of the land. I believe it is related to the seedy world of drug making, dealing, stealing and snitching.
ALL, my personal speculation at this point in time. MOO, JMO and all that good stuff