Chael and King Mo actually have really good chances. All they have to do is get a takedown. Rampage's shown a takedown susceptibility in recent years-- especially against someone who has as aggressive a double-leg-against-the-cage wrasslin' style as Chael-- and Mitrione's only weapon is a right-hook. That's all he's got. I mean, technically he has more, but if you have the skills, as long as you can avoid his right-hook you've got a real good chance against him, and King Mo's good enough to wrestlefuck him.
Bader-Nelson'll probably look like Cormier vs. Nelson did, except without all the excitement.
Mir-Fedor is the one that's probably the closest. Normally Fedor's best chance of victory is to go his classic chain-wrestling Sambist style-- closing the distance with a big strike, getting underhooks and working a series of trips and takedowns in quick succession until one of them lands, then doing what we all know Fedor does from the top that I'm not educated enough to elaborate on-- but with Mir that's not the best strategy. They're both pretty chinny now, though, and that's the big thing. Fedor learning from his mistakes and actually keeping his hands up and having enough tact to watch out for his opponent's best strikes is gonna be the real deciding factor probably-- if he can do that, and not do something like keep his lead hand low when the only thing he has to worry about from his opponent is their lead-hook on that exact side (like against Mitrione), he'll probably win. If you're gonna keep your hand that low, at least jab to the body; that's one of the best things you can do with a low guard. That's literally all he has to do; he's fast enough where he doesn't have to worry about Mir getting a surprise takedown, Mir's not gonna work him over in the clinch, the ground game isn't gonna be a factor since that's not gonna be Fedor's road to victory unless he has balls of caliche, he just has to take his lack of comparative durability to his prime into account and protect himself accordingly.