Good angel?

[BG-57]

That's true, the *helping* angel has the same effect as the original revive spell BUT it's what the graphic of the content counts. The graphic image of the *helping* angel looks absolutely different than the image of the original revive spell, therefore it's supposed to imply something differently, despite of the same effect. Also, your whole characters don't control that angel, someone else did. Therefore it's not supposed to be a gameplay element.

Which is why I mentioned the tapir. That's an uncontrollable gameplay element. And FFVIII Shiva looks different from FFVI Shiva. Aren't they the same entity despite that?

But it is not a gameplay element because of this

In Winhill it is said that Ellone was in a festival and they liked seing her prancing like an angel.Squaresoft didn´t create this dialogue at random.
It is to show that the angel which appears at Ulti´s time is Ellone.

And the fairy thing.

Since these concepts didn´t appear anywhere else on the game it must point to the angel.It must point to something or it would be a pointless monologue.

That's one of many possible interpretations. While most that appears in a video game is deliberately planned, not everything has additional, deeper layers of meaning. Some statements should be taken at face value. Or as Sigmund Freud once supposedly said: 'Sometimes a cigar is just a cigar.'