Could the Mystery Monster be a siege?

I'm talking about EM166. I remember Gogmazios, Unknown Guardian, and HR Zoh being discussed in this subreddit but I wanted to add a Educated Guess. I haven't been active on this subreddit in awhile, so call me out if need be.

I don't think it's out the realm of possibility for a new siege Monster to Pop Up. Kulva Taroth was awesome in World, and Lao Sha Lung was cool to play with friends. We do have the City of Wyveria and we haven't fully explored it possibly. It would be a great place to face off against huge Monsters. The Forbidden Lands has been locked off for 1000 years, who's to say there's undiscovered behemoths ready to be discovered.

Just something to consider before the end of the year