Kungen:
You note that the CoG is only 2 mm higher. I didn't have the specs, but the E70 is 50 mm taller, so I would have assumed it was more than a 2 mm difference in the CoG.
You note 15 kg more for the E70, and that same number is in the BMW training material you link, but published figures for both vehicles show a 350 lb/160 kg difference. That is probably due to the standard equipment in the North American market, as compared to the bare vehicle. The weight increase is also consistent with the performance reduction of the 3.0, even though it went from 225 hp to 260 hp or thereabouts.
I don't disagree with your comments on dry road handling, but with respect to the snow handling performance of each vehicle, I think it still is pretty much 98% about the tires.
The DPC system (in the X6, not the X5) does vary the torque split between wheels, but I didn't know that it added throttle. I would have said that it rebalanced the throttle. I wasn't referring to simply backing off the power to one axle by varying the torque split, but to actually powering through a corner.
Good discussion. 
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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