Cuz.........Again, I think you're missing the point........You're broad brush approach seems to dump everything into the same bucket with regards to sequence of the pitching motion........
Think of it this way........NOTHING the arms/trunk/head does, causes the muscles of the legs to fire RAPIDLY AND POWERFULLY........NOTHING.........
In order to increase the ballistic energy supplied by the legs.........Something CAN be done to "trigger" that ballistic response from the legs...........It doesn't HAVE TO be done.........But it CAN be done.........
Swinging your arms UP AND DOWN and BACK AND FORTH, outside of momentum, has no bearing on how much energy is produced by the muscles used in leg drive..........
