My theory is, RL holds the key to finding BG. They are not the same guy, but RL is either knowingly or unknowingly helping conceal BG's identity. LE will search the property, find evidence to prove to RL that they know what he knows, and he'll help them track down the real perp.
That being said....even though I do NOT buy into the theory that RL did it, here would be the clues supporting that theory:
1. There are several parts of the pictures that link RL and BG as the same guy. The jeans, the gait, the tendency to pocket his left hand, the gut, the camo hat, the green strap on RL's chest, the layering, the body size, ALL of that makes me think these are the same guy. The one piece that doesn't fit is the age. I cannot make BG out to look over the age of 60 in my mind.
2. RL, being 77 and a known drinker might be crazy enough to make some of the odd mistakes we have seen to this point. Only a drunk, senile old loon would kill 2 people and then wear the same hat and gun holster the next day in a news interview. Only an old guy losing his grip on reality would not notice that his victim was filming him and then not take her phone when he left the scene. He would have to be so out of touch with technology that he didn't recognize the phone as being a video recording device and then so out of touch (and so "new" at murder) that he didn't bother to search them and destroy the cell phone.
3. I highly doubt this old 77 year old man was conveniently shopping for tropical fish at the perfect time of the murders. Does he have a badass fish tank? Is he a fish enthusiast? Prove it. I don't know any old farmer type dudes like this to have a dual interest in extreme drinking and tending aquariums.
4. You can tell this old dude has seen some hard work in his day. His hands are rough and his sleeves are rolled up in some pics. His boots are old and muddy. You know how they always say last thing to go on an old boxer is his power? That's very true. There are a lot of old Indiana farm boys that look like fat old men who can break you with their bare hands. Don't think this guy couldn't pull off this crime. 80 year old men kill deer in the woods, drag them a mile, hang them, and clean them with no help.
5. Police just took his damn truck. That seems odd to me. He's already got 3 DUI's, but they are just now taking his wheels? They expect to find something.
6. This might be the only human being on the planet who could actually keep watch on that bridge and strike a vulnerable victim when no one else was around. Anyone else would need to arrange this meeting with the victim ahead of time. He's the one guy who could stalk that spot regularly because he lives there.
Again, this is not my preferred theory. I'm just giving you this side of the coin