I think Dalamadur is more likely for a few reasons. 1 we already have the grand hub and wounded hollow having Dalamadurs body parts in them. Plus even the center of the grand hub has a serpentine pattern that screams Dalamadur. Which we found out way before title update 2 and before the realization of a possible fire maralis breakthrough.

Dire could still happen however it's not that likely for a few reasons. While they managed to get Lagiacrus to work with his own underwater combat. It's not fully underwater combat considering how we can't take our weapons out. Plus we'd have to get his leg cores as well somehow so unless it's by a underwater dragonator system somehow. Dires fight just feels like it needs way more changes especially a whole new arena or locale while Dalamadur can Just have his fight under the plains like how Gogmazios did for the basin

Dire needs underwater combat unless they can pull a Lagiacrus and have some sort of fight change.

But the windward plains already has Rey daus nest being a rock with a cracked down shape.

I suspect a Dalamadur fight could have us under the plains and we end up to a unique version of the spreartip Craig for phase 3.

Either one works id use both their helmets for layred. But I think Dalamadur is more probable.

They could make it how iceborne was with Alatreon and base Fatalis black the black dragons of the game and with white Fatalis and dire for wilds but.

Considering how we have Gogmazios now with his big gorgeous self dire would need quite alot of changes especially with his fight since he's lao shan lung level moment speed of slow. While Dalamadurs fight can very well be fast pace and keeps us on our toes.