It's important to look at TAR3 in context. It came on the heels of Rob & Brennan winning TAR1 in dominant fashion, and Chris & Alex winning TAR2 in slightly less dominant fashion. So going into TAR3, there's only one team of quote unquote alpha males in the cast, and based on precedent, the twins were the biggest threat to the rest of the cast. Honestly, it's a miracle they DIDN'T make the final 3, given how weak on paper the rest of the cast was (especially with Teri & Ian and Flo & Zach as two of the final 4).