Rupert isn't exactly what I'd consider alpha male
It seems like that BB alliance from season 5, the horsemen, with the popular alpha males...and Cowboy. So they probably needed a 4th and who else but Rupert? I am surprised Ozzy wasn't brought back. I don't think his popularity went down that much from FvsF. If anything many people seemed happy he got played, and some people found him boring and poor at the social aspect at the game. He was just good eye candy for me
Maybe he turned it down, but considering Cirie and Parvati are there it's probably better, as he'd have a sole mission to get them booted and that's not fun TV. I'm surprised by some of the choices for this show. Amanda? Danielle? Jerri? James? Tyson the little troll, just because he was Coach's sidekick? Wasn't there some battle between Probst and Lynn over who was cast, his people or her's? I wonder who won, because Colby and Tina are friends of Jeff's, he has a weird love obsession with Coach, and they all seem to love Rupert for whatever reason. I still wish more people from early seasons were included. Heck, I'd be willing to bet the majority of them don't watch the show anymore, so they wouldn't know anything about the current contestants or how they game has changed.