[Pan_Yans Wife]

But riding implies that they are not participating in the movement of the sled. If that is true, why even bother having riders? Let the dogs do all the work, and get all the glory, when they win.

[Iwo Jima]

I can't see that a blind driver's abilities are being tested, other than the ability to hang on and not fall off. Balance, in other words. Now, the ability of the dogs of a blind driver would be severely tested.