Only person I see as a winnable fight is Struve. I think even the lower end guys like Lewis, Palalei, Jordan & Rosholt beat him, maybe I am writing him off but he has looked terrible in his mma bouts.
He hasn't flash ko'd someone since Wand in 2006...for a heavyweight who was once a top 10 kickboxer, that is a pretty bad stat to have. It seems like everyone in the UFC HW division has one punch KO power. CC doesn't have the power, speed or strength he onec had...he has a shitload of experience & technique but his body is shutting down and he isn't physically capable to use what he knows.