Jones is still the one who has to prove something in heavyweights.
the question should be, is Jones ready for Francis yet?
Of course they both have to prove.
We know jones can fight. We've never had an issue with that. He just has to show us that he can still perform with the extra mass. As far as Ngannou every agrees he's getting better and better and better and better. Well he has to prove at some point that he either got as good as Jones ever was or that he got better than Jones ever will be.
There are no answers for either fighter until A. Ngannou gets some defenses under his belt (which I think he will be able to do). B. Jones gets some heavyweight wins under his belt (which I think he will be able to do).