InTgreen - flapback is the major feature because the speed differences between the advancing and retreating sides of the disc are so great, remember we are talking V squared here so the effect is marked throughout the flight envelope.
The inflow angle changes are far less but most noticeable during the transition to forward flight - it is the difference between the inflow angles at the front and rear of the disc that is important and what causes the roll towards the advancing side. Inflow roll is present throughout the flight envelope - different designers have different ways to compensate for it.
I am sure there is a very complicated mathematical proof of what happens but I stick to the simple P of F answer which is an acceptable explanation for something we know happens
