Battle 1 comes down to Iceman and Weapon Omega really. Mimic has a good powerset, but hasnt been too impressive outside of his exile counterpart. If weapon omega is written properly, he takes it.
Battle 2 is taken by the regular X-Men.
Battle 3 goes to Dark X-Men. Marvel Boy apparently has weapons that can wreck the Sentry, they'd be enough to put down anyone on the other team at least long enough for a win. Moonstone also is a handful. Hawkeye would likely die, but may be able to take out someone with him.
Battle 4 is tough. Really depends on how Sentry is written vs Nate Grey. Can go either way honestly. The rest of the members make it too close too call.