[shmaster]

The mix up of the Gabriel's name with Michael isn't an effect of Angel Fall.

Spoiler:

Rather it is an effect of the 4 arch elements going astray. Angel Fall is a by product of that as well. You seriously Angel Fall can be constructed by accident? Hell no. It is because the 4 arch elements were already in disorder.
Michael and Gabriel, then Uriel and Raphael, their positions have switched.
According to Fianma, if the 4 arch element continues to stay like this, the world can be in danger.