I agree about the double pivot, and I'd like to see it, but Ange was so stubborn in his formation last year I'm not sure how likely it is. Especially with the targeting of Eze, he's another #10, honestly I've no idea how it's all supposed to fit together.
One thing giving me hope is that Ange has been known to adapt and evolve once everyone is singing from the same hymn sheet.
He just wants everyone to have belief in what he wants them to do first and foremost before adding and amending. I imagine to show the players he's all in and be needs them to be too. The basic fundamentals will be there (playing out from the back, high press) and that'll never change but slight tweaks will always happen.
End of last season we saw us go to three at the back AND play a formation with a false 9 and show some tactical flexibility. Not to mention there were times last season where in game we went to a double pivot and it helped us out.
It's why I believe we've been linked with Gallagher for so long despite having an abundance of 8s and Gallagher isnt a 6.