LOL... you can ask a lot of folks around here how "weak" I hit.
Tim? Stew? Shane? Stacy?
Something that may affect your assumptions:
Common sense seems to suggest that any force which goes into my hand is force that does not go into the target, and when I read 'the weak' I thought it meant 'weak part to strike with.' Admittedly I have a lot more reading to do.
No worries here. The learning curve is pretty steep. I remember lurking around here for months before posting as much as you did, so you're a brave guy. The terms "weak," when referring to the sword, however, comes from the orginal languages as "schwech" or "foible." It is the part of the sword from roughly the middle of the blade to the tip, especially the last, say, 10 inches. It's called "weak" because of the amount of leverage that can be applied using it when in the bind or in deflection. It is the part that you are supposed to hit your opponent with--where the most power is transferred. The "strong" (Starck or Forte) of the blade is from the middle to the hilt--where you have the most leverage in the bind.
As for shock going back into your hand--this is not a good thing. Your grip, if supple, will not feel much at all when you strike, regardless of the power generated. If you feel too much reverb, you're gripping to tight, and you'll be unable to react to subtle changes in your opponent's pressure at the bind, you'll be more likely to be disarmed, and you'll have less control over your strikes.
You are absolutely correct that power is generated by the entire body contributing to the strike--this is important and fundamental. Form, however, generates most of the power. If it is properly transferred to the target you *won't* really feel much of it coming back to get you in the hands or otherwise. Cut "with serene hand." Calmly, controlled, but still violently.
Jake
Sen. Free Scholar
ARMA Deputy Director