Scytale, a face dancer in the book Dune Messiah, mentions to his fellow conspirators that the Tleilaxu had made a KH of their own; Apparently this was done through genetics.
Giving them in the order that they appear in the book, I will provide a couple of quotes and ruminate on them.
Despite the murderous nature of the plot he hoped to devise, the thoughts of Scytale, the Tleilaxu Face Dancer, returned again and again to rueful compassion.
I shall regret causing death and misery to Muad'dib, he told himself.
He kept this benignity carefully hidden from his fellow conspirators. Such feelings told him, though, that he found it easier to identify with the victim than with the attackers- a thing characteristic of the Tleilaxu.
So, how is it that Scytale identifies with Muad'dib? Did he know someone like him or experience something like him? Well, if the Tleilaxu had made a KH of their own, Scytale may have heard of the event(s) or may have even met the person. Scytale's sympatico is also of particular interest to me here. Herbert senior mentions it a couple of pages later and says this about the sympatico: "a mimic's insight with which he could put on the psyche of another as well as the other's appearance."
Irulan then makes an important observation later on in the chapter:
"Scytale," Irulan said presently, "it is said that you Tleilaxu have on odd system of honor: your victims must always have a means of escape."
I'll leave that one up to you to bounce around in your head, for now. Now, while discussing the Idaho Ghola Scytale reveals something very interesting:
"How has Idaho been conditioned?" Irulan asked.
"Idaho?" Edric asked, looking at the Tleilaxu. "Do you know of an Idaho, Scytale?"
"We sold you a creature called Hayt," Scytale said.
"Ah, yes-Hayt," Edric said. "Why did you sell him to us?"
"Because we once bred a kwisatz haderach of our own," Scytale said.
With a quick movement of her old head, the Reverend Mother looked up at him. "You didn't tell us that!" she accused.
"You didn't ask," Scytale said.
"How did you overcome your kwisatz haderach?" Irulan asked.
"A creature who has spend his life creating one particular representation of his selfdom will die rather than become the antithesis of that representation,' Scytale said.
"I do not understand," Edric ventured.
"He killed himself," the Reverend Mother growled.
And some other quotes that might lend themselves to the discussion ( still in chronological order):
"You are devious, Scytale," Irulan said.
How devious she must not guess, Scytale thought. When this is done, we will possess a kwisatz haderach we can control. These others will possess nothing.
"What was the origin of your kwisatz haderach?" the Reverend Mother asked.
"We've dabbled in various pure essences," Scytale said. "Pure good and pure evil. A pure villain who delights only in creating pain and terror can be quite educational."
Here lies a toppled god-
His fall was not a small one.
We did but build his pedestal,
A narrow and a tall one.
I entreat ye, Link: discuss!