I suppose there's the possibility that that army is in fact made up of Nova Dragons (the dragon you fight before being able to enter Memoria) though I can't quite remember it they looked that way in the FMV. Off memory, they seem to be the same as Kuja's dragon but I thought I'd throw that in there anyway.

Interesting thread idea, by the way. Just shows that there's always stuff in a game that's worth having a think about.