If you get a chance to watch the video again (
Pinal County Sheriff's Office), Bonnie's taillights glow at 00:12:45, and between 00:12:55 and 00:13:00, the man at the other truck turns to watch her truck and raises his hand and forearm while facing her truck. I wish I could slow down the video so I could see better. The times I gave were the time stamps on the gas station video. It is also best to watch it in full screen mode.
He could be totally innocent, and it could all be coincidence, but with the numerous time gaps in the video, I think the video of him being there was kept in, he might be significant.