Well, the rear disc may move, but were talking thousandths of an inch here folks. LOL

Yes, all clutch discs are going to drag on the flywheel some, that's what the syncros are for is to keep the input shaft from coasting with the motor and making it impossible to shift without double clutching.... Now, this drag should only be in the neighbor hood of a few inch-lbs of torque, but it's still there. Point in case. Push the clutch in, put it in gear (clutch discs have now STOPPED spinning) take back out of gear and wait for a bit (with pedal down). I bet after 20 seconds or so, when you go to put it back in gear, you'll have a bit of a pause as the syncros bring the clutch discs back to a stop. Why? Cause the discs started spinning after you took the load off em.