The roadblock equalizes things a little. Luke is right there waiting with Vyxsin. Kynt can't do that bad on the puzzle because they arrive at the mat in fourth and are passed by the sisters because of their penalty.
Because we know the arrival times I also speculate that there will be no second Uturn used. Ron and Chris and Zev and Justin arrive at the Pitstop at 2:16 while the redheads arrive at 3:30. If either R/C or Z/J were Uturned as well, they sure did a better job of the second task than Jamie and Cara.
I also can't figure how one of these could be Uturned and arrive at the same time as another team. For instance if R/C are Uturned, how do they do the other detour and catch up to Z/J at the RB to check in at a similar time? Especially when this same extra task takes the cheerleaders a really long time.
The only options that I see are:
R/C are Uturned and are REALLY good at the detour
R/C are Uturned and Z/J are REALLY bad at the RB
Z/J are Uturned and are REALLY good at the detour
Z/J are Uturned and R/C are REALLY bad at the RB
FT/BE are Uturned and are so good at everything that they arrive 16 minutes before R/C and Z/J
Jet/Cord, Gary/Mallory, Margie/Luke, and Kisha/Jen have presumably already chosen not to Uturn based on no photo up when Kent gets there.