Although I couldn't stand Heidi in the house - not even one teeny quality about her - I think it's hard for me to make that call because we never really got the chance to see her as the balance of power in the house shifted. She went out too early for me to decide if she ever would've become humble as she realised her group was being pegged off one by one. Mikkayla however was just horrid and that's coming from someone who was a big fan of hers at the start. To me, for all the positive effects the sisters had on the group, Mikkayla had negative ones multiplied by 10. I think that's why every time I see her and Jade being all lovey dovey I just can't forget the things Mikkayla said about her in the house and especially the bracelet incident. There are just so many examples of shitty things that she said to and about people that she really was the worst one for me.
I think you raise a good point about how the group power dynamics impacted on their behaviour. For me though I couldn't imagine Heidi ever becoming more humble given how she reacted when Jazz and Caleb were evicted. I could only imagine that getting worse had have she been around when Tully and Matt left as well. The self-entitled arrogance of that group to form that ridiculous mutiny against Tim was still the dumbest thing I saw the entire series. I remember a clip where she was telling Ed that Jade wasn't allowed to be told about their mutiny because she was too stupid to see what Tim was doing and would screw it up for them. That in itself I found ridiculous because I think Jade had a much better read on Tim than anyone in the mutiny group did. I just couldn't get over the self-entitled arrogance of the woman. It was her way or the highway, and anyone who didn't see it that way (including the public) she labeled as clueless idiots.
I felt sorry for Mikkayla at the start, and I do think some of her later nastiness stemmed from bitterness she was still carrying from the beginning. Ironically though, as good as Tim was to Mikkayla, I also think that friendship was bad for her because I think it gave her a sense of security that bred arrogance and a feeling that she didn't need to be nice to anyone she didn't want to because she was "safe". I still think deep down that she didn't actually like Jade, the Sisters or Ben as people but she more liked what they did for her.
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