Longevity: being an android, Coulson is immune to aging and disease and his life will continue for thousands of years, like the Chronicoms.
I think we both are right that Coulson is immune to aging and disease, but I had put that his life would go on for thousands of years because I knew that androids don't die naturally, which is why I also called them ageless immortals, if not was destroyed to destroy the Chronicom spaceship, sacrificing himself in the process; and then, Luke himself had said and sensed, like Sibyl, that he was not a human being, but an android, saying how he felt in several billion years, after the people he loved had died.
Okay, it may be that what I put in may be exaggerated, but what I thought seems likely, at least that's my theory.
Hi! I don't think it is a good idea adding the names of the targets seen in AoS705 in the actual MCU reality targets. That is not confirmed. If the Chronicoms wanted to conquer Earth in the 70s, then they should kill people from that moment on, like Susan Morse, who I doubt would be a dangerous person in 2014.
Yeah, the Darkhold itself is not seen again after Morgan took it from Robert. It is not clear it's current location (Morgan kept the book in a hotel where she was living before being banished back to the Dark Dimension)
I think Marvel TV still had plans for the Darkhold in a potential fourth season of Runaways, or Hulu's Ghost Rider.