Good angel?

[Roogle]

The angels could be a gameplay element, not a plot element. In some previous FFs Life/Revive magic is represented by a cherub that appears over the fallen character and brings them back. Also there are uncontrollable gameplay elements like the Tapir in FFVI that randomly appears and wakes up sleeping characters (in mythology tapirs devour nightmares). It might just be there to let the player know that even if characters fall out of the party they will be safe and sound by the game's end.

There's no reason for Square to put an angel in the game play, because the battles of Ulti were so EASY, even without the help of angels >.> There has to be a reason why it was invented.

I do not think that the final battle of Final Fantasy VIII was easy because I did not understand the junctioning system when I finished the game.

Anyway, I think that the whole motif was designed for gameplay reasons of allowing a player to utilize all of his characters for the final series of battles. Final Fantasy VI invoked a similar concept — if a party member was knocked out upon the destruction of a part of the final boss, he would be replaced during the transition to the next battle. It was a way of ensuring that multiple characters could be used and that it may not necessarily be a bad thing to build all characters evenly instead of focusing on a core few.