Kamala Khan.

1) Beast could REALLY screw over the X-men in this event. He is always a traitor in the VS events...
2) I worry about Quake because if she calls in Shield, the X-men will be in trouble.
3) Lockjaw and Karnak are obvious problems that could mess any good team up.

Most of the Inhumans on your list have been show on upcoming covers for new books, Triton has not so I'm gonna go with him.

I know it's early, but I love how ain't nobody worried about Medusa! LOL

Black Bolt

Mostly Karnak because he has the potential to be hax. (Like if he break out of Jean's illusion) He'll probably find a weak spot in Emma Frost diamond form and shatter it. Black Bolt obviously won't be down for the rest of IVX and they might take it to the extreme and ask Maximus for help.
Other than that:
Triton = lul
Nuhumans = kek
Medusa = rofl (as if she's a threat) (Marvel will probably PIS her feats and beat some Xmen that she shouldn't be capable of doing.)
Beast = Will most likely cause the X-Men downfall. It will either start or solidify Xmen loss.

I cant believe that they have to worry about karnak. Psi bolt from jean could make him go to sleep for a day. When he wakes up, tk hold and throw him to outerspace. He is street level and so is medussa.

I still love how nobody deems Medusa a threat-- Yet X-Queens Emma and Storm are ALWAYS a threat! Heck even X-students are more of threat than Medusa! :D

hey man. maybe shes born with. maybe its maybelline.

Emma uses cerebro and inhumans all go to sleep

Yeah I ended up going with the majority. Black Bolt won't stay down for this event and he's a powerhouse. Karnak will probably pull something ridiculous because of his powers. Beast will probably be the one to ruin everything for the X-men.

Editorial

The way they overblow Karnak is laughable. The idea that they need four top telepath to hold him is even more laughable. It's pretty clear that Soule hasn't worked it out before and has to make sure that only inhumans they have are going to be wanked out out of all proportions to make it seem even somehow close.

No, it's not close. And the way they took out Black Bolt makes it seem they aren't even bothering with that.

If I'm not correct, didn't downer leave the team in Death of X, or am I thinking of someone else?

Anyways, Daisy seems like to me a big threat. Shield trading and powers similar to Avalanche. That could be both her greatest strength and downfall, which is why she has combat experience to back it up. Black Bolt is a treat, but feel a lot better with Dazzler and Emma around. Karnak is another one I am most worried about, Jean may have handled him, but she won't loop him forever. His ability to see the future and weak points is what makes him a terrifying threat. Lockjaw is also something to worry about.

Everyone else, I am either not to familiar with or willwill get bodied easily by one X-Man.

none

Reader is a credible threat

What I want to see s Dazzler own Blackbolt that is really the only pairing I wanna see. His voice turned into light and shot back at him. Would be amazing.

Karnak is the scary one. Too bad Legion isn't around I'd love to see a Legion vs Karnak situation.

Karnak is a super hard core monk I sorta bought he wouldn't have good TK defenses.

none of them.

2 things.

1) I love how Karnak is more threatening than Black Bolt.

2) Nobody cares about Medusa! HAHAHAHAA