(Spoilers) Nicaragua vote question that I've never understood to this day

So at the Final 10 of Nicaragua, here's what I don't understand about the vote.

Obvoiusly Jane has Immunity, so she's safe, but with Marty gone at F11 after a season long seeming Brenda v. Marty feud, why the hell did the Brenda vote happen, let alone 8-1-1?

So yes, I get the obvious -- Brenda was the largest threat left (and arguably the biggest threat the entire game thus far).

But you had an alliance of Brenda/NaOnka/Kelly S/Chase/Fabio/Jane/Holly, with Benry/Fabio/Dan as the outsiders.

Obviously Dan wasn't as big of a physical threat ha, but Benry and Fabio were. Holly and Jane had flipped at that point, so the vote could have gone 5-5, and NaOnka was getting ancy about Brenda having too much power, but:

  1. If the tide is turning against Brenda as the BIGGEST threat in the game, this is still the Final 10 (with no real reason to know two players were going to quit after). There couldn't have been a bigger shield, for Chase/Sash to keep.

  2. Chase and Sash both had idols. And not only that, they had inroads with Jane and Holly. They could have easily (or hell even just one of them), slipped an idol to Brenda who would def have made it seem like it was her own flashy move so one of those boys likely wouldn't have gotten heat for "turning" on Jane and Holly, which given the circumstances, it was Jane and Holly turning first.

  3. Finally, even if they got some heat, that leaves Brenda/Kelly S/Chase/Sash with 4/9 of the votes, AND another idol to use. Chase and Sash still have their options open -- they could default to Holly/Jane if they really wanted to afrter the vote (presuming they target Benry in the idoled-out vote, and it leaves a Brenda v. Holly/Jane feud where Brenda would always be HOlly/Jane's target over Chase/Sash if they found out an idol was slipped and wer epissed. Plus; Sash had the second idol anyways!

  4. Finally, finally; it eliminates a physical threat and rogue-ish vote in Benry, and Brenda at that point was so much of a target she'd have to rely on Chase/Sash -- no way woul Dan or Fabio want to work with her, and Jane/Holly certainly wouldn't have. Plus, lets face it, Kelly S was no big powerhouse threat to be worried about Brenda/Kelly S working something out.

In conclusion, i just don't really get why they seemed to pull a big risk in a very fluid game by taking out the biggest shield that early, making them then SOLELY relying on Holly/Jane (who had flipped multiple times), and (if Benry went), Fabio and Dan who they weren't that close with. If anything it opens up all their options to keep Brenda while Brenda is targeted, Dan/Fabio are outsiders, Holly/Jane are on a rampage, and NaOnka is starting to get erratic.