I couldn't identify anything from the speed bump photo, all I could see it's that the team probably wear dark coloured clothes, in which it doesn't look like Josh/Brent who wear red in the picture. I think we need to dig out Leg 3 U-turn part to see the background of all team photos.
Also, I agree with Prophet that maybe it took James/Abba more than 10 hrs to find the passport (if they could find it). I think there are 2 situations which they would put a TBC ending here:-
1) James/Abba couldn't find the passport and couldn't start the next leg at all
2) James/Abba could find it but after Trey/Lexi started the next leg
With the help of HoO Ryan/Abbie and Josh/Brent would only be late for around 7-8 hrs, so I don't think they took 3-4hrs more than other teams to make Trey/Lexi started next leg before them. Also, James/Abba obviously spent more time (maybe 2-3hrs more) than other teams to complete last leg tasks, so if they did spent 3-4 hrs looking for the passport, they may even be the last team check in.
One question, I feel that Ryan/Abbie and Josh/Brent would step on the mat together for the last leg, if they really did so and were the last 2 teams, who would get the speed bump?