I think this is a good techincal discussion over what's really happening in a bike drivetrain. Nobody's been insulting or condescending. I really do think that changing pulley sizes and cage length are both ways that derailleur engineers can increase or decrease chain storage in the derailleur, and I think my pictorial model has demonstrated that. But, if I've misinterpreted something, I hope we can keep the discussion going.

I'm here to learn!