What are other early strong alliances that have been defeated besides onion and Rotu? Maybe La Mina and Raro?
I'd say the Moto 5/4 Horsemen is a good example (though it's tricky because they lost Lisi and picked up Mookie and Dreamz pre-merge, then Dreamz, Stacy, and Boo all flipped, so it wasn't a spectacular defeat save for the Edgardo boot, and the only people they booted as an alliance were Liliana and Michelle).

Guatemala's such a blur to me; I can't remember who the alliance of douchebags was that season, but I know there was one.