The first paragraph in your last post sums up what I am trying to point out: That we can formalise various theories until the cows come home but...
...the wing still flies regardless of the theory in current use.
...we're all baffled by how ground effect works...
Would we be a little less baffled and a little less critical of bookworm's theory about the ground getting in the way if we were to SEE what was going on? Again, watch some low level spraying, you'll soon see what happens.
Further, take a ride in a fabric covered biplane. Compare the fabric of the top of the lower wing to the bottom of the upper wing. There's something going on there.