Ishmael/Balzammon/Moridin can obviously see, though Balzammon at least no longer has eyes. I think the DO's power has more to do with that then any special genes except those for channeling.

A Fades ability to Travel Shadows also seems to mesh with Ishamael's original teleportation in tEotW. And additionally, what you mentioned above about the nature of the blight. I also think a Fades Powers might extend from a similar merging with TAR that we were discussing in regard to the DO and the Blight. Imagining using a shadow to Travel makes perfect sense in TAR as well as stepping outside the pattern as an alternative.