^ Yeah, those are the scans I was thinking of too. I just don't take it as literally as you.
I agree that Mandrakk's machinations may have been subtly egged on by the Great Darkness. But unlike The Empty Hand, Mandrakk is not a literal part of the Great Darkness. The Great Darkness really had nothing to do with Final Crisis.
Technically The Great Darkness is everything the Presence isn't. And acting like Mandrakk is a manifestation of The Great Darkness is as tenuous as suggesting that all the good deeds that Superman performs is a direct manifestation of the Presence. Superman is his own character, has his own origin and has his own agency. Mandrakk also was his own character, had his own origin, and had his own agency.
Those scans are inelegant attempts at reframing everything in the past as if the past were always leading up to this current storyline which will be the bestest, most ultimatest ever!!! But that's my own opinion. I could deconstruct it further but honestly, I don't really care to take the role of Mandrakk's white knight fanboy here.