Yes, but that doesn't mean RA knows that part was filmed.
In fact, maybe that was early LE strategy. Get tips but also leave room for anonymous BG to come forward. To admit to being, say, on the front end of the bridge.
Any way, you look at it -- sure, midwest, lots of men look and dress like BG but only one confessed to being there.
I wonder if he ever saw the lady witness who turned back. Maybe no.
The juveniles never saw A and L, correct?
It would've have been then and surely now to RA's advantage at trial (crafted alibi) to get himself off the bridge and out of Dodge as early as possible. Right behind the juveniles. Only he didn't leave then. Lady witness saw him.
What are the odds of RA happening to hike the MHB that day at that time on that bridge but wasn't BG and never crossed the girls' path nor crossed the path of his doppelganger?
Forget odds, the chances of that -- if there's a number less than zero --
JMO