I would like to believe JBC is going to prove out to be BG, because a) it would bring some closure, b) would mean the killer of Abby and Libby is off the street, and c) I'd prefer to think there can't be numerous monsters capable of such heinous things in that area.
But the color of JBC's facial hair, as seen in the link quoted — doesn't seem to match what I see on the BG video. Every picture I've seen of JBC with facial hair, it looks dark brown. In the video BG looks to me like he has medium color facial hair (blondish-brownish-reddish, not dark brown).