Hey have you been stealing my theory from off of DS?
I have mentioned the week 8 curse many times, fro BB5 onwards it's pretty clear but it was more of a personal curse to me because it was always my fave housemate that went on Week 8, Victor, Science and Nikki. And also those three housemates all had big fanbases and at one time or another where up their with the bookies and fans as faves to win, but in Week 8 they messed up, (Victors argument with Shell, Science's argument with Orlaith and Jaynes bigging up of Nikki making her bitchy and cocky). That curse was broken this year when Charley went, I didn't like her at all and she was never a huge favourite.
But yeah a big character usually meets their downfall on Week 8. The early series don't count as much because Week 8 was pretty much the penultimate week.