One thing to note
Have you noticed that in most cases, since Season 12, the winners of the Amazing Race tended to finish in the top three (for example, TK and Rachel finished third, Nick and Starr and Meghan and Shane finished first, and Tammy and Victor finished second)
While in Amazing Race Asia, the winners usually struggle, Adrian and Colin and Sam and Vince finished seventh place, while only Zabrina and Joe Jer finished in the top three i.e third.