Completely forgot about Caroline. I don't know whether she was ever favourite, but I'm sure she was 2nd in the first week. And yep, Rebeckah also. Pretty sure she was fave for a short stint, until someone overtook her. Then Aaron (I think) remained fave for most of the series from W3 onwards with Alex occasionally overtaking him.
Wasn't Luke BB9 one of the faves on launch too? Govan BB11 was also in the Top 3. How things change! Gina ended up doing the opposite, she was 120/1 to win in the first week
4 weeks later, she was favourite.