Adam, poor Adam. Adam is almost nothing now. Not only is his soul a lump of charred ashes, but his mind is gone too. If nothing else, Chuck should bring Adam out to send what's left of his soul to eternal rest. It's cruel to leave Adam there, even if Adam's mind is gone. Besides, isn't Chuck God? Can't he restore Adam to how and who he was before the cage and angels fucked him up? I think Chuck owes him one.
Michael. That angel made his bed. They didn't have to fight. Even Lucifer (while in Sam) told Michael (while in Adam) they could walk away. Michael, being the ever obedient son, told Lucifer it had to end in a battle of brothers. Dean, Cas & Bobby got in the middle of the battle of brothers called Armageddon and all died except Dean. God "recreated" Castiel as Dean's guardian. Cas brought Bobby back and got Sam out knowing Dean can't function without Sam.
A month on earth is 10 years in Hell. Sam's soul spent a year and a half in hell, 18mos = 180yrs. Sam still has the memories, but Castiel took away the trauma that was caused to Sam's soul and mind when, he cured him in the mental hospital - taking into himself all of Sam's physical and mental illness which relieved his suffering.
Michael and Adam's been in the cage since May 2010. 6yrs(6×12=72 mos) & 8mos (80mos on earth) = 800 years in Lucifer's cage located in the lowest, darkest part of Hell.
If Michael came out right now, I think he would be like Lucifer in many ways. He would still be an archangel and have his normal appearance. He would be angry. The world would have 2 dark sinister angels ready to destroy all that God created. I would fear Michael in every way as much, if not more, than Lucifer. They would team up, in my opinion. Forsaken by their father, they'd want revenge. Humanity would be puppets and play things to them.
Adam is just a crumpled shell. Powerless, unable to speak because the angel removed his tongue. Even if he had a tongue, his mind is gone. He's a pile of bones that's shriveled to nothing. He's blind because the flames scorched his eyes. He's deaf because Lucifer blasted his ears out with angelic singing. Only reason he's alive is the magic of the cage and Hell itself that keeps those bound within alive for eternity. It does this so you are forced to suffer.
Poor Adam. Pray that Chuck ends Adam's suffering and pulls him from that damned cage straight to Heaven where he belongs!
(The art/picture is not my creation. Credit goes to the artist & The CW/Supernatural)