My theories weren´t incoherent.

And it makes no real sense to say they went to Winhill for that.At least no in FF8.
I played the game many,many times,went to many places and my experience says its bulshet.
Where else and when else do you find monsters entering a city to raid it?
You can only refer to Winhill and Esthar after the Lunar cry(which is Winhill on the future by the way).Where else?Actually the natural behaviour of a monster on FF8 is not to raid a town (unless their personal researcher let them into).