LeeD, the OP was specifically about the physics of pronation. From the content of your posts, it appears that - whatever your tennis skill level and on-court experience may be - you do not have any specialized knowledge of the physics of tennis. Why then did you weigh in at all - and why did you start in with childish personal insults of other posters who actually addressed the OP's question about physics?
Your remarks trying to correlate number of posts with their worth make no sense. As the saying goes, "It is better to remain silent and be thought a fool, than to open your mouth and remove all doubt."
Seriously, it's behavior like yours that degrades this forum and makes it less worthwhile for everyone.