As per usual, you see only one way, black or white.
But what is more powerful?
Are you isolating the racket characteristics from the PLAYER's kinetics?
CAN they be judged separately, or does one actually become linked with the other?
Say a baseball batter look for pure power for hitting home runs. Can he just look for a heavier bat? For more power? Or can he use a lighter bat, choke up on it, and still get the power?
What do you think? I know BarryBonds uses the lightest bat of all the homerun hitters, and get's his power from bat speed, not bat kinetic energy.
So there may be more than one way to look at the power equation.
And what would be the best way, in your opinion? I don't see any problems with Jacks information. He's talking about keeping extraneous variables (such as your "PLAYER'S kinetics", lol) consistent, and then measuring the impact of flexibility when these are kept equal. This is, after all, what I was asking.