SPOILERS lol again XD
Well Benson died anyways, so their only good-eyed gunman being able to shoot the C4 with Memphis near, is out of the equation.
About Thanatos being, Thanatos... we'll never know his truest intentions tbh. Maybe it's some physics, sciencey, universe-themed bs we can't comprehend. Might cause some time paradox lmao. He COULD say how many bombs, or tell us what is the most efficient way to END Memphis, but then again, maybe his master isn't allowing him so? During this time he's still controlled