I think the input is actually the ring gear, but it matters not. What I think you are missing is that the clutch is not like a classic engine clutch on a single shaft varying between 0=totally independent speeds and 100%=identical speeds, it is a clutch between the two shafts continuously being driven by the differential at nearly identical speeds. The gears of the differential and the DCCD clutch are acting in parallel, not series.
It goes from allowing the gears of the diff to spin freely at whatever rate the gearing calls for to not allowing any of the gears to spin as if all three axis/shafts were welded together.
Again, I am still talking about theoretical split, not actual based on traction. If the clutch locks any two axis, gear ratios are negated since none of the gears are turning relative to each other. And if it acts as resistance between any two axis, the split will tend towards 50/50 which is how they accomplish the variable.
Please reread Mike's document, specifically, page 7/64 of the document which clearly states:
Quote:
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By varying the clutch engagement torque from 0-100%, the DCCD module can vary the drive torque distribution to the front wheels from 35:65 to 50:50 (Direct 4WD condition) using the planetary gear type center differential.
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That is pretty clear IMHO.