1. Almost all of those feats was done when she had the phoenix. Thus, they are not valid in this fight.
2. Jean was using cerebra when she split up charles. It also pretty much cost him half of his memories, good job jean. Cerebra amplifies her abilities many times.
3. Nate burns out? nonsense. Him burning bright and faster, always referred to his life expectancy. Unless they plan on fighting for 27 years, it won't be a problem.
4. Dark Phoenix? You're an idiot. No phoenix.
5. One of the guardians of the M'krann crystal? Do you mean Jaf? Thanos couldn't break the armor Nate made.
6. " He has more power than Xaiver but he did not defeat him, pulling his form from the astral plane was actually a gift for onslaught, but the battle never ended Xaiver left because Nate was just destroying things lashing out with his powers like a dick." Xavier knew he was facing a superior opponent and played dead. Yes he played dead. The superior combatant doesn't play dead.
7. Jean's showings of being an Omega class mutant? I'm rather iffy about those. We haven't seen any proper feats without the Phoenix, not on level with Nate's showings.
Rest of your rant doesn't make sense at all. Split it up into paragraphs like normal people do. You're nothing but a rabid Jean fanboy, who purposely ignores facts and rules.
No Phoenix, jean is on her own. The same person who's defeat, no one? If Jean is so powerful without the phoenix, she wouldn't be constantly relying on it to do stuff. She would've stopped Apocalypse before he was severely weakened, she wouldn't have been raped by Stryfe. Jean surely wouldn't have lost to Xorn/Sublime. She even had the Phoenix in that fight.
Nate can kill her using his telepathy, how? I'll make it simple for you.
Nate >> Xavier >> Jean
Or how about this.
Nate makes earth go bye bye, then leaves for 617.