I followed him after Fightville. He's like a superior Bisping; makes his way right to the top and gets caught before a title shot. However excluding the 2 hooks from MJ and McGregor, he's only ever been outclassed by KZ back when he was 23 or so, and he has improved a lot since then.
King Mo says he's the best fighter at ATT. Not to say he's the most talented guy on the planet, but he's certainly very tough and hardworking. I'd be happy to at least see him fight for the belt, even if he comes up short.
IMO he's the toughest matchup for Khabib. Dude had seriously good wrestling and counterpunching.