Overeem didn't 'fold' against Bigfoot. He was gassed, got cornered, and was subsequently obliterated with a barrage of haymakers that no one except maybe [insert guy with ridiculous and PROVEN chin here] would have survived.
I mean damn Bigfoot slaughtered Browne too.
Overeem didn't tap to strikes or anything, just ate shot after shot until he finally went down.
That said, he's still top 5 easily, holds wins over Werdum [who is ranked much higher] and Hunto, [who is in line to fight for the belt] and obliterated Brock Lesnar who was a god around here for a long time.
So Overeem. Talented, experienced, this is like his what, 50th MMA fight? Hopefully he gets a title shot before he retires.