This article is from the Dune FAQ, by Alan Schwartz with numerous contributions by others.
- Duncan's memories of Leto as an infant in "God Emperor of Dune" are
inconsistent with him being a ghola of either the original Duncan or the
Hayt incarnation:
"I died defending Paul and his mother in a cave-sietch beneath the
sands of Dune."
[Duncan to Leto]: "Is it true what your Fish Speakers say -- you
have . . . memories of. . ."
Idaho remembered the strange child-twins, really: Leto and
Ghanima, Paul's children, the children of Chani, who had died
delivering them.
"What was he like in your day, the man Leto?"
"Which one?"
"Yes, I forget there were two -- the grandfather and our Leto. I
mean our Leto, of course."
"He was just a child, that's all I know."
If he was a ghola of Hayt, he should be a mentat, since the Duncan in
_Heretics of Dune" becomes a mentat when his memories are awakened.
 
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