If...and I mean IF-

Isabel swaps to Red team, which I don't think she would purely because of story reasons that I may explain later, she is not using her idol.

I really wanna nip this theory in the bud cause Isabel is a popular choice for Spencer to send to Red Team, and if she does I don't think she would use her idol even if Jade was getting pressed. Why? Well besides the reasoning that the writer's wouldn't play two idols premerge unless they were gonna introduce a third one later on, why would Isabel do so to begin with?

Isabel's a potential ally to Jade and Spencer, and forcing her to use an idol to save one of them is a stupid decision unless they were trying to go for a flush. Its two against God knows how many, Spencer isn't well liked in the cast, and people are catching onto Jade, they are gonna NEED Isabel and her allies post merge to stay afloat and even if they do want her to use it, Isabel's got her own plans. She's honestly not gonna use it for anyone besides herself if it came down to it cause, well, she's aiming to win. If her alliance sticks through even with Spencer's swap it's a bare minimum of three people working with her, Jade if she merges would do the same, plus Spencer, and bam while she's in the center she's safe for another play with the idol.

Isabel would genuinely need to lose braincells to play her idol, and she'd only play it early if Jade or Spencer rat her out and say she has it, to which they lose a potential ally.

So yeah regardless of the swap I think she and her idol is safe. Ngl Spencer is probably gonna try to blackmail her for an ally since he'll be on the outs on Blue, Jade the same on Red (and honestly, I'm stating to believe Jade just gets shot premerge now).

Anyways that's all. Wisabel hours probably. Spencer might make a new friend. Watch Invincible.