someone else wrote...
Also, in "Retribution" I believe the Reapers whisper to Khalee that the 'marriage' of reaper and organic is a mutual salvation - a comment which Karpyshyn leaves unexplained.
They don't whisper. They speak through the altered Grayson (who does have some indoctrination capability, however):
"Why are you here?” Kahlee asked. “What do you want from us?”
She wasn’t sure if the Reapers would even reply. All she was hoping for was that she might be able to engage the Reapers enough to give Grayson a fighting chance. A fighting chance to do what, however, she couldn’t say.
“We seek salvation,” Grayson said, much to her surprise. “Ours and yours.”
“Salvation? Is that what the Collectors were doing? Saving those human colonists? Is that what you did to Grayson?”
“He has been repurposed. He has evolved into something greater than a random assortment of cells and organic refuse.”
“That randomness is what made him unique,” Kahlee countered. “It made him special.”
She noticed that their pace had become more measured and deliberate. If Grayson was still inside there, if he had any influence at all, he was using it to slow the Reapers down. He was trying to buy her time to escape. The best thing she could do was try to keep them talking.
“Why can’t you just leave us alone? Why can’t you just let us live our lives in peace?”
“We are the keepers of the cycle. The creators and the destroyers. Your existence is a flicker, a spark. We can extinguish it—or we can preserve it. Submit to us and we can make you immortal.”
“I don’t want to be immortal,” she said. “I just want to be me.”
They were barely moving at all now. Grayson had managed to bring their hurried escape from the Academy down to a crawl.
“Organic life lives, dies, and is forgotten. You cannot fully comprehend anything beyond this. Yet there is a realm of existence beyond your understanding.”
There was something odd about the things Grayson was saying. She knew he was speaking on behalf of the Reapers, but it seemed like he—or they—actually wanted her to understand their position. It was like they were trying to persuade her to agree with them, but they didn’t know how to frame their arguments in a way she could relate to. Or maybe there simply was no way for organic beings to relate to hyperintelligent machines.
“We are the pinnacle of evolution,” they continued. “Yet we see potential in your species. You can be elevated. The weakness of organic flesh can be cast aside. You can transcend yourselves.”
The words didn’t really make any kind of compelling argument, but she felt as if there was some deeper meaning to them.
“Your understanding is limited by genetics. You cannot see beyond the brief instant of your own existence. Yet our knowledge is infinite, as are we.”
The more Grayson spoke, the more his words seemed to make sense on a deep, almost subconscious level.
“The laws of this universe are inviolate. Immutable. Your resistance will only lead to your extinction. What we are—what we do—is inevitable.”
Kahlee was so far under the Reapers’s spell, she wasn’t even aware she was nodding along in agreement.