Interesting question.

The rear driveshaft is connected to the output of the motor with a splined shaft so it is fixed. There is then a clutch pack that drives the front driveshaft and a motor that varies the pressure on the clutch pack and thus the power sent to the front. Can't say for sure that disconnecting the motor would eliminate all pressure on the clutch pack but it would be very little if any as there is no spring in the assembly to preload it.