That was always my thought, Del. Even after washing and putting in your leave-in, you just plain have more condish on your hair (well, IN it). That would account for the extra softness people are reporting and the extra definition (I think I read some reports of increased definition).
And the decreased dry time for some (since the condish displaces the water).
I wonder if your pre-poo condish can be something you don't typically like as a rinse out? The only condish I've really liked for this is GVP balm, which is also my rinse out and my leave-in (I'm scared I'll overuse it and then it won't work for me anymore!!).