I feel the same with Joyce.
He seems to throw a lot in what seems like slow motion in comparison to other heavyweights but it is effective. His wins against Dubois and that last night evidence of that although as you say Takam is 40.
He is borderline world title level now. If he can take a shot from the heavier hitters then who knows if he has the fire power to get them out of there. I am thinking Joshua gassing like he did mid fight against Klitschko as the most likely one he could potentially beat.
I think Fury would be too slick and quick for him over 12 rounds and wouldn't get caught.
Good luck to him though. He seems a likeable enough bloke too.