Brian Abraham,
You post is interesting but we need to take care in interpreting it.
The words
"At this point any increase will not result in any increase in gas velocity (hence the rate of escape of the gases)."
Mean that increasing cylinder pressure will not increase the leak rate. This is just basic high speed duct flow theory.
But it does not mean that increasing the size of gaps between the rings and the cylinder wall will not increase leak rates.
Larger gaps will result in larger leakage rates, lower cylinder pressures and ultimately lower power output.