This ending is so beautiful in many aspects. The song. The vision of Arios sinked without its wings. The Cherudim with his eyes pierced. O-Raiser Crashed down and Seravee separated from it's other half. Then you perceive all cockpits are intact and open so the Meisters aren't dead. Then you see all of them take action agaisnt the dark fate foreshadowed in the previous ending (Prototype) Their cloths alone like they have liberated from their past to find their own self. Finally The 00 Standing upfront the world and Setsuna Giving it a smile, like thanking him for all it has done.
I don't know why I feel that in many gundam animation series, I feel that this 00 series has the heaviest storyline. The whole ost is different from the others.