Thanks for putting up slides, quite informative!
But I guess the real question is Intel does not uses Gallium, nor has it mentioned anywhere in the slides.
I wonder why?
The "too much code already" or "investment protection" are not arguments, because in IT, there is no such thing as "investment protection" in face of future changes.
If they want to have full control over the stuff, why not experiment in gallium branch? So much better cooperation! Will they be reinventing X13 when Wayland debutes? (yes, I know that wayland is mostly supported by intel, it just for sake of example).