It was not deposited by wind. I'm referring to layers in the Canyon that are out of sync with the expected uniformitarian scheme. But they are dried sedmiment slurry all the same. they moved across the "SW" of the US as it was then, and some continued on to carve submarine canyons off the Pacific coast. The reason for the east to west movement was the finding of New England sandstone in Grand.
One of the geologists explained his model of tectonic lift and fall with a chunk of one of those smoother foam rubber balls on water with sediment. Starting with it on top and dry, you push it down, it is covered with drifts of sediment, then you let it come back up. The drifts are shaped by the path of least resistance as the water recedes. the more solid the sand or gravel in the sediment, the less it moves the last time water crosses it.
In the case of the earth, at the same time as this contortion, 'Pangea' is also separating horizontally.
Still waiting for a citation to the scientific literature discussing the New England sandstone in the Grand Canyon.
As to the rest of your post---not likely.