Natalie and Baylor are still in the game to fight against JJ at F4.Well, things are looking up. I'm being understood. So, I'll push my luck ...
First: I merely inserted Baylor's name in an II slot that could just as well have been filled by Keith's. And assumed for the purpose of the argument that neither side knows how the other will vote.
That said: I suggested splitting the three votes - assuming also that the HII would be played for the one of the two (of the three) who appeared to be the most likely target - because the tactic broadens the possibility - but, admittedly, does not guarantee - that one of Jaclyn or Jon would be voted out.
Then.
And, I think, that if Natalie played it safe only to reach the Final Four with an intact/inseparable Jaclyn and Jon - who have no reason to wish to sit beside Natalie at the Final Tribal Council - she would have won the battle and lost the (Terry Deitz ... ) war.
Although, I will also admit that there is something to be said for living to fight another day. She could, I suppose, win the last II Challenge.
And I do really like your concluding scenario.
G