Recorded voice report:
'As far as I know, as a young race, the Tau Imperium was created to disseminate a new password. Password that has much more truth in it, than believing in an Emperor or any other great lord. We're fighting for something, that under your Emperor's rule, you'll never achieve. With help of our Kroot and Vespid Allies, the Tau became a strong force - strong enough to convert you into our truely faith. We don't want to fight. We don't want to do any harm or kill in order to spread our words. We want just to convince you to a better and future way, cause the Emperor will die sooner or later. But we? The Tau Dominion, as long as the last converted will survive - survive will also our password. You know what we're fighting for? You want to know, humans? It's Greater Good!' - ...end of transmission...
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The warp storm was a freak incident. It's possible that it was manipulated by someone or something. But it was the Greater Good that allowed the Tau to reach the level they have reached. During the early days of the Tau, the tribes of the Tau fighting long bloody wars with each other. They were actually on the verge of wiping each other out.
And because the Tau were completely united, they didn't waste time, energy and lives fighting wars with each other anymore. So all their time and energy became focused on improving their technology and making their lives better. It is their unity that is the Tau's greatest weapon.
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It was proven under a dissection that the Ethereals didn't "guide" through pheromones,but through their acquired reputation.