I have to add onto wild guesses too,
Total speculation, but:
A. The rockers do lose their passports and bags and Ryan & Abbie and Josh & Brent fall way behind, correct? My guess is that the rockers somehow finish the leg before Ryan & Abbie and Josh & Brent, but are unable to keep going since they have no passports, such as the same scenario Zev & Justin faced in TAR 15, then saying that they are unsuccessful in finding their belongings, Ryan & Abbie and Josh & Brent have a chance at catching up.
B. The rockers do lose their passports and bags and Ryan & Abbie and Josh & Brent miss their flight, but somehow with a miracle get a flight out and back on track, allowing them to surpass the stranded rockers. Seems unlikely, but anything can happen.
Apologies if I have any false facts on here!