I started wondering about this yesterday. Wondering if maybe Erika/Boogie just put the whole thing on about her turning on him.
Think about it. I think Boogie knows that even though Will won before, if he was up against Will, he'd never win. Ever since Boogie said weeks ago that he might have to backstab Will and get rid of him to win, just like Will did to him in season 2, I've been waiting for it. Now, the problem for Boogie getting rid of Will, was he had to keep him around to get to the finals, but when it came time to get rid of Will, he had to look blameless in the matter.
Like I said Boogie was really trying to cause trouble between Janelle and Will in the hot tub, and I think it was to set her up so Erika could start whispering in her ear and make her give Will the boot. Had Erika won POV instead of Janelle, she would have just out-and-out booted Will. In either scenario Boogie is blameless.
Once Will was gone, it was time to get rid of Janelle, next. Now the last time that someone Janelle felt close to got booted, she started losing heart and stopped caring about the game and if memory serves I think it was Will that helped get her out of her funk. So that puts her off her game and gives a bit of an edge to Erika and Boogie.
It would also explain Erika's stupidity with her goodbye videos if she purposely was turning both Will and Danielle against her so in the finals when she's up against Boogie, Boogie wins.
Just a theory.