I think non pshychic people are called blunts.
I also like the idea of Eldar creating the tau. In the ancient times, the Old Ones created the Eldar as a race to carry on their work. Now the Eldar wish to do the same with the tau. The Eldar have provided to the tau, what any other civilisation needs; Purpose. A nucleus on which to focus their efforts.
That is why the Tau are so successful. That's until the stuff calms down around the Eye of terror. Then the Imperiums is going to go Fishing
