As a fan of UFC, I have to admit my favorite athlete is Jon Jones.  I know his attitude has worsened in recent years, but I still feel a sort of connection to him since we attended the same high school.
Jon Jones is very good athlete 
I am curious to see how he does when he moves up to heavyweight.  I believe all of his wins have come at the light heavyweight weight class.  He could end up fighting people who are up to 60 pounds heavier than him now.
Jon Jones Their talent is impossible
Are you talking about his positive steroid tests?  I guess there is some question as to whether he is "natural" or not.  But he has won all of his fights whether he has tested positive or not.
Jon Jones Their success depends on his talent, it must be admitted
I agree.  He has beaten the best fighters in the world without steroids, so that cannot be the reason he is so good.  I cannot way to see how he does fighting heavyweight fighters.
What do you consider his best match?
I thought his second match with Daniel Cormier was his best.  He knocked him out and seemed to be in control the entire fight.  Cormier was a great fighter himself and seemed completely outclassed by Jon Jones.
No one will ever forget that incident