What if Joey/Meghan & Mona/Beth had found out and booked the tickets on the earlier flight to Edinburgh?
Caroline & Jennifer still fall behind at the bagpipes Roadblock, get to the Detour in last place and get U-Turned by another team trying to avoid elimination (Mona & Beth, maybe), leading to their elimination.
But Bates/Anthony & Max/Katie, IMO, did the tasks quicker than Mona/Beth, not to mention they had a Speed Bump.
With this in mind, I think B/A & M/K would still arrive to the U-Turn board first and stuck with the plan of U-Turning J/M & M/B, saving C/J, and resulting in either J/M or M/B eliminated.