I cannot make a good prediction because there are too many ?'s.
Is Cain back to his old form and healthy?
Can JDS grapple?
Neither has looked bad yet, so I have no idea about weak points or game plans.
On the videos:
I guess Cain is rock solid, because that is not the shit you do if you are worried about injury.
The swing/clean/low pull looked like an accident looking for a place to happen, and it was the least questionable of the bunch.
The weighted knee strike screams hip flexor pull/lumbar spine injury.
And leg extensions carry a pretty good amount of shear force with them. Doing them ballistically is an interesting idea.
If those videos are representative of what he is doing, he has until Nov to get injured or I may have a crisis of faith about biomechanics/physiology.