I've got some speculation about the whole Brenda/Dawn thing that I'm going to put in spoilers because it does involve some spoilers/speculation that I read on Sucks. Read at your own risk! Final Tribal Counsel spoilers/speculation below.
When I was watching this past episode, I couldn't help but be struck by how completely random and non-game advancing the whole thing with Dawn's teeth was. Sure, it was a fascinating bit of drama that was interesting to watch, but the producers are editing this to tell a specific story; not show a Best Of reel of their month out there. They cut out stuff like that all the time from the show because it doesn't have any real bearing on the game. So to go out of their way to show that with Dawn and feature silent little Brenda, of all people, I had to wonder, what story were they trying to tell?
First off, one angle is them showing how Dawn is getting more and more unhinged. That was a running theme of the whole episode so it definitely tied in there. But, they had plenty of "paranoid/unhinged" Dawn to show elsewhere that didn't involve any personal embarrassment that affected her behavior...so again, why show this?
My ears perked up when we heard Brenda say, "I won't betray Dawn after this, and she won't betray me". I don't think that was there by chance. I think the whole reason why they decided to feature this moment is because it influences the end of the game.
According to Sucks, Dawn makes the final Tribal Counsel but does not win. Since she's been shown to be orchestrating a lot of boots and alliances here, I think the editors are editing this to explain to us all why Dawn DOESN'T win. Her consistently unhinged behavior and what smells to be a really harsh backstab to Brenda would point to this. I think Dawn is going to backstab Brenda, hard, and it is a huge tipping point to the jury on how they want to vote.
So yeah, them showing this clip isn't as much about Brenda as it is about Dawn and how this created a situation where it made Brenda's impending boot so distasteful to the jury that it was a significant factor to her losing a million dollars.
Anyway, just a bit of speculation from me with some spoilers thrown in. I was kind of meh on this season at first but it's shaping up to be quite good in the back half!