Neat! Thanks, b.t.!we deliberately left it open to interpretation, but personally, i think brainiac's ghost was totally a figment of lex's imagination...in other words, lex was cracked, and manifested the ghost himself, just out of his own burning desire....once darkseid returned, lex's subconcious was convinced that brainiac was gone for good, hence brainy's voice went bye-bye....
we never even considered that grodd was manipulating lex by sending him visions of his lost partner-in-godhood....hmmm, interesting interpretation...i concede that it's possible....not much definitive textual evidence to suport it, though....
My textual evidence -- and this is all speculation, of course -- largely came from the Dr. Destiny cameo in "I Am Legion." True, Grodd has mental powers, but there was no evidence that he had the type of mental power to cause visual hallucinations. However, if Dee was there, maybe Grodd brought him out of that coma / repaired his brain to fulfill the function of keeping Luthor docile by controlling him with a Brainiac hallucination. As for the end, well, maybe Dr. Destiny bought the farm with the rest of the Grodd's people in "Alive!," thus freeing Luthor from the figment.
Could have been an act. Grodd's great at manipulation, and maybe he was just surprised as to how the hallucination would manifest itself.My biggest problem with that is Grodd's obvious confusion when he first realizes Luthor's been talking to himself during half of their first conversation in "I Am Legion."
Just speculation, of course, but it's fun.