The further discussion appears to assume that the ball maintains this same orientation (seam to the slips) after it leaves the bowler's grip till the first bounce, and presumably even after that, since it is any deviation of flight after the bounce that really outwits the batsman.
This is manifestly absurd. The bowler mighthave some control on the orientation of the seam till the first bounce only if delivery is without imparting rotations but certainly not after it bounces.
Interesting though the wind tunnel experiments are, it is difficult to see how these results can be applied to practical bowling.
Chandra P de Fonseka