I simply stated the possibility of a new Destruction faction appearing, as you never know what GW might do.
Ah, I misunderstood then.
A new Destruction faction doesn't have to be bellicose and war-mongering
That is how GW defined destruction though. As the various races who's sole purpose in life is to get into fights.
Which is also why they're all so similar. They're all unwashed illiterate hordes who enjoy bullying those weaker than them, with basicly no interest in things like art, architecture, technology, or any of the other trappings of civilization (as a race, there are always a few insane individuals who break the rules)
It rather limits what you can do with destruction, as the moment a race starts actually becoming even remotely civilized they immeadiatly belong to order according to GW's own definitions (assuming they're not undeath, and don't worship a chaos god)
Indeed Flesh-Eater Courts might have worked as a Destruction faction given that they are the most removed from Nagash, if GW hadn't still given them some ties to him, because the Ghoul Kings are so caught up in their delusions and because the Ghouls, much like the Ogres, are only interested in devouring anything they can find.
FEC are weird. They're one of the few factions that fit in multiple grand allegiances.
They're undead, so death.
They're insane, and can't really build much of a civilization as far as outsiders are concerned, which fits with destruction.
But from their own point of view, they're shining beacons of virtue and civilization, and they will try to protect their fiefdoms and allies loyaly, which fits with order (in kind of a weird twisted way). They're not completly destructive, they do actually try to build up proper kingdoms, with the necesary infrastructure needed. Just through an insane lens, so they end up "farming" corpses or something insane like that. But it's still some form of organised aggriculture.
AoS needs some Tyranids type love. An outside faction that does not belong to any of the current powers that threatens them all and aligns with none of them.
I guess you could potentially make a tyranid-variant into a destruction faction.
The singleminded consumption of everything in it's path fits with destruction & it's something different from the unwashed hordes of barbarians that destruction currently consists of. Plus destruction already consists of outside factions who just attack whomever they happen to stumble across, including themselves. So that fits too.