Incorrect.

Twice as much torque goes to the rear wheels so unless you apply braking force on the rears or some way (eg rev enough) to overcome the torque bias, the fronts won't turn. The DSC system may see the rears "spinning on ice" and clamp three binders and get power to the fronts. Until that happens the rears should spin much more freely than the fronts.

The TC is torque split not speed split so the speed of the input is not divided like you are thinking.

I'm not sure exactly how that works but consider the x-drive system: if you stop the front output entirely by removing the front drive shaft, it doesn't take double or half the rpm to drive a particular speed: it's exactly the same as before.

Take some video when reproducing the problem or do some reverse testing: turn one front wheel at a time and track what happens at the TC output. If things are binding at the differential you should be able to tell

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)