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Probably what remains is the 2WD version of the 4WD pseudo e-diff feature of xDrive (I know it does not have a true e-diff). There is some evidence that even with DSC/DTC completely off, you still have the brakes allocating torque by stopping wheel spin on all four wheels. So maybe with the TC disabled/running open, you have RWD-only version of this.
It would make sense, suppose somehow front diff blows up, front driveshaft breaks whatever, you'd want some kind of e-LSD left in RWD as a default.
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