Concerned Papa I think you got it!
Jo's lawyer said that Jo was a passenger in a vehicle. It has to either be pertaining to the blue van or one of Ron's vehicles. But it's Ron who says they, him and JO, use to fish down there at that dock. IMO, Jo got caught up in this mess.
What if Jo was with Ron that night? The passenger in Ron's car?
The passenger in the car I thought he was referring to the girl he drove down to Florida with and then they drove back to TN.
I think if JO had left a day before Haleigh would still be alive.