Yep, you got it right. The sul'dam provides no power to the weaving, just control. All the strength comes from the damane.
It's a link, but a very weird one.
As Moggy put it
The brute throwing of numbers against each other is highly suspect, even if your numbers are correct.
But if you really want to, dealing with "population rates" like that is a bad way to go about it. What is key, is how many channelers have been trained and ready for immediate action, not how...