The Cain who lost versus Francis Ngannou was the same Cain who lost vs Werdum, i don't think Cain is or was a good fighter, is pure muscle with a nice ability to receive hits, but not a fighting machine anymore. If we want to learn about good fighters on that category then take a look to mirko crocop
There is not much to look at now. Mirko is retired now. He has
sufferen a stroke few days ago and is unable to train (just to train) for 3-5 months.
Maybe he will do some show matches in the future. But if I were him, I would not even do that, because just a slight punch to the head now can cripple him.