What's your problem, ft?
You have already agreed with the theory in your first post. There was no mention of level flight aerodynmics, just lift.
But you agreed that the lower surface pushes air down and the best way to achieve a figure for that is just beyond the angle at which the flow over the upper surface has broken down.
And the fact fits the theory of just less than a third of the lift. The theory can say nothing about any other angle where the two forces are not separable.
In your effort to put me down you contradict yourself which rather detracts from the put down. Paragraph 4 concurs with the fact that "The pressure difference between the upper and lower surface of a wing alone does not account for the total lift force produced" and yet you choose to ignore that.
Certainly is a can of worms!