No one, including Mr. X, appears to dispute that the descending blade creates a greater aerodynamic force. The discussion appears to be more about the order of importance of the various couplings.
This is true.
But as for your last two Guess's I thought something different.
He is not mentioning any of the other three prop Effects
Gyro forces, Torque, or Spiral wash. and as far as I knew. Torque dose not induce a Yaw.
See. I thought he was talking about something different.
I thought he was not disputing that the down blade dose produce more force.(as you said)
Rather, I though he was disputing
the cause of that extra force on the down swinging blade. (Just the P Factor part)
First he acknowledges the prop is at a greater AoA with his "NOT THE WHOLE PICTURE!!!" comment.
Then he dismisses it with the "the descending blade is NOT at a higher angle of attack" comment.
What is greater by the way(In the P Factor part). Is it the AoA difference or the Speed difference ?
My guess would be the AoA.
As for which of the Prop effects cause more yaw. it would vary on the individual plane and the Attitude and Speed and Prop type and....... so on.
What say I put this out there for the Fixed wing Prop guys to have a look at?