Vorticey - no I said the driving section moves, not gets bigger. The sequence is cyclic forward - disc tilts - inflow angle reduces - AoA decreases - less lift so blades flap down (decone) - C of G moves out - blades slow down.
Admittedly this is a simplification as the advancing and retreating blades will be experiencing different inflow angles but is an acceptable explanation of what happens.
bye the waiy verticee is yowur spill chocka forked?