Okay, zeratul knows tha "Samir Duran" is basically non-existant, it's just a disguise. He knows that the real mastermind behind the creation of the Hybrid is a "far greater power". Does Zeratul know wht this "far great power" is? No. Hence the line. That, and consider the fact that WoL does refer to both Dark Origin and Twilight. You heard right, and if you don't believe me, check out WoL manual:
And here's a part leading up to Zeratul searching for the prophecy:A FAR GREATER POWER
Upon leaving Char, Zeratul and the dark templar investigated protoss power signatures on an uncharted moon nearby. There they found several stasis cells containing protoss and zerg. Further investigation revealed that Samir Duran was using genetic manipulation in an unholy attempt to create the hybrid: creatures with mixed zerg and protoss DNA.
Most disturbing of all, however, was the fact that Duran’s attempts were
proving successful.
Unmoved by Zeratul’s disgust, Duran revealed that he served a power far greater than Kerrigan and that the creation of the hybrid was the last step in a vast cycle that was approaching its end. Duran claimed that the hybrid, who were scattered on a thousand different worlds, were on the verge of completing their development, and they would change the universe forever when they awoke.
Memories of Raszagal have plagued Zeratul, and he was deeply disturbed by his encounter with Samir Duran. For years he kept to himself, racked with guilt and sorrow, until a valiant terran archaeologist in need of Zeratul’s aid sought him out and convinced him to emerge from his self-imposed exile. Since then, Zeratul has uncovered a revelation somehow related to the xel’naga, creators of both the zerg and the protoss. He has been seeking additional clues to unravel the mystery.




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