I think we can all agree RA is a witness.
So I'll call him one.
The group of juveniles were witnesses. 4 girls iiuc, one much younger. All saw one man, whom they each described differently. Verified timestamps.
RA saw a group of juveniles. Raging debate over 4 or 3. 4 isn't 3. 3 isn't 4. But RA supplied a KEY detail, he thought there was babysitting. IMO there's the 4th -- the young one being babysat. Dispute settled as far as I'm concerned. He saw three teens and a little (the little being babysat). Locks the timestamp.
BB saw that group crossing the bridge as they were leaving and she was arriving. Verified time stamp. BB begins her third loop. So far, she's seen zero men.
Sister drops AW and KG, I'll estimate 1:49 but I'm sure that can be tweaked from LG's phone, sister's phone, and CCTV.
AW and LG start along the path.
BB approaches the bridge. Sees one man. On the platform.
RA says he was on the platform. He gives several time possibilities. 1 to 3, corrected to 1:30 to 3:30, later noon to 1:30, and another time posited later as leaving at 2:15. Best we can do is show he was there at least at the same time as the juveniles (and there are verified timestamps for that), plus time to reach the platform where BB saw the one man and he said he watched fish.
No one saw another man, not even RA. He describes himself as wearing jeans, a jacket, a head covering, a scarf, I think he called it.
After seeing one man on the bridge, BB turns back, passing AW and LG as they continue toward the bridge. In the after 1:49 but before the 2:06 photo. Solid timestamps.
AW and LG reach the bridge. Whether a man is still on the bridge, we don't know. Perhaps they met the man on the path, walking or on a bench or waited for him to leave the bridge.
At 2:13, LG begins recording a man, one RA never reported seeing, on the bridge behind them. A man wearing blue jeans, a blue jacket, a hat.
If RA was leaving at 1:27, he wouldn't have seen the juveniles where they saw him. If he arrived at 1:27 and made his way to the MHB, he would have been on pace to be on the bridge right about the time BB reached her turning point.
The man every witness saw but RA is on the bridge.
Headscratcher for RA too. "If that's from the girls' camera, that's not me." Then who is, RA? Because it's either you or it's not-you and one of you pushed the other off the bridge.
Because you're both on it.
RA is IMO the last man standing.
As good a witness as the others, for what he self-reported. They establish his timestamps, he confirms them, he describes the man they saw, same as the one LG recorded, when he described himself.
He can't get off the bridge. That is, until he forced two little girls off the bridge at gunpoint and on DTH.
JMO