Michael would have gotten caught up on the details enough to argue the exact placement or inclusion of a particular song. Dean can take the fact that he doesn't as proof that he is still wholly himself. At the time Michael didn't remember his decade-old promise to put him back together good as new, but as off-putting as it might have been at the time, it had come from an honest place. He has more care for his tools than Chuck ever did.

He'd have trouble quantifying it, and he'd be loathe to admit it out loud, but Dean does have some inherent value to him now. Not as something he can wear, but as an individual.

The answer isn't what he's expecting, not that Michael could have expected something like his Father losing to the Winchesters and their adopted nephilim in the first place. This one he doesn't need to see for himself. He pulls it behind his stony exterior and examines it, considering the implications. He's still alive. That's dangerous. Castiel proves that even being consigned to the Empty isn't a guarantee that someone will stay dead, but it's a higher barrier to overcome than wandering the Earth as a human. Then again, how many years are left in that vessel of His—another fifty, another sixty? Less, probably, as he doubts his Father will be a fan of exercise and eating healthy.

"Revenge over finality. Hope that doesn't come back to bite you."

Meanwhile, Michael will hope that doesn't come back in a way that affects Adam. Clearly, Dean and Sam can handle the rest.

"Fitting, however. For all the angels He's sacrificed to make the Winchester story happen, for all the worlds He's doomed, the one thing He's never experienced is being one of the pawns."

Maybe he'll find that unexpected twist He never got from the countless thousands of realities He created.