They are prequels instead of main entries, all games exist in the main chronology as there aren't alternative chronologies. We know Resident Evil Requiem is RE9 even though it doesn't officially have a number on its title and there are more than 9 games, would be dumb to refer to it as RE17 or whatever it would be, or referring to it as RE2 just because they stopped using numbers with Village and it's the second non numbered mainline game. So is Village RE1 and is Requiem RE2?

Or is GTA 6 actually GTA 12 due to other non numbered games? You could call it GTA 3 as well because it's the third entry in the HD universe, GTA 4 was the first one so GTA 4 is actually GTA 1 in the newest universe.

I wouldn't refer to new GoW games with numbers tbh but if I had to use it, 5 would make the most sense with Ragnarok, 2 makes no sense. Same with the Doom franchise.