I've always thought some or all of the twists that Big Brother introduces mid-season were not entirely planned at the outset of the show. I think they like to keep a few options available in the event a popular house guest gets kicked out too early (e.g., Kaysar) or someone flips out and has to be removed from the house. Likewise with some of the double evictions. These things give the producers some flexibility to deal with unfortunate circumstances that history has shown happen pretty much every season.
I just don't believe Allison Grodner and her cronies have things plotted out with such detail at the outset of each season that they could say, for instance, that after week 8 one of the houseguests will have a chance to get voted back in. It leaves the producers open to criticism for meddling in the show and trying to influence the results they want.
Back on topic, has a previously-evicted house guest ever lasted more than a week or two after getting voted back in?
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