I guess we'll see. I'm not an expert on Kruijswijk, but i also don't think Romandie is a point of reference when talking about the biggest bike race in the world when it comes to team pressure and working towards a greater good. And while i agree he may be worse then Dumo and Roglic in basically everything, he isn't afraid to attack early. Even if he loses 2 or 3 minutes on them (and Bernal, Froome) by moneytime, if he goes early on the last climb, Ineos will still need to react. So i do not agree he'd be useless in a tactical sense, even if he loses minutes. I can see something like a Carapaz situation with Froome, Bernal, Roglic and Dumoulin eyeballing each other, while Kruijswijk attacks with 10k to go. It may not happen, but it could happen.
As for Bennett, next year De Plus will be a year older and better. There were already stages in July, where De Plus was clearly the better man uphill than Bennett, while also having had to more work early in the stage, and early on in the TDF. Remember that Bennett was plan B, unlike De Plus. There was a stage somewhere in the last week, where De Plus had to work on the penultimate climb, and Bennett was getting dropped by the work De Plus was doing, trailing a few meters behind the bunch. When De Plus 's work was done, i think Bennett had to come back and pull the last 1K. But De Plus came back in the descent, had to pull again through the entire valley, and the first few k's of the last climb. When it was Bennett's turn, he couldn't do anything anymore. Last MTF it was the same thing. De Plus doing the work for TJV, Bennett's input was negligible iirc. So i don't really agree with them leaving their best climbing dom at home. I think their best climbing dom will be there.