Well, i missed a lot here eh?
As for question of TPB not having a cross over point, i understand that one of the tactics for placement is hitting the ball near the teable edge lines at the elbow. Ive seen how my shake handed friends have to react to it, and that odd looking backhand, usually weak, looks really awkward. Other than that maybe they will lean to one side to hit a forehand so close to the body it looks like “chicken wing”.
With tpb, the whole arm can pivot like a pendulum, hence there is no awkward point having to hold the bat at such an angle. And, using only one side means that there is no switching of rubber orientation, possibly speeding up reaction times for blocks (Ma Lin and Chiang Peng Lung on that list).
However, Felix almost always play every shot on his backhand with rpb, which is similar in mechanics with the shake hand system. Hence, there is a crossover point at the elbow and rpb itself has slightly less mobility compared to shake hand, with the awkward bend of the wrist.
The only person i can really say that still has an element of traditional penhold back hand with less of a crossover point is Dang Qiu. Now without Matsumoto or Kai Yoshida playing on the world stage, there isn’t any professional single sided penholders anymore, or those who primarily use only one side, like Ma Lin. Dang Qiu has pretty good forehand, and i can say in terms of proper forehand with the power that distinguishes a pen holder, Dang Qiu beats Felix, for now anyways. With Felix’s grip, it allows for a flexible wrist for playing pretty good rpb backhand, but i was wondering with that amount of curled and stacked finger on the back would it result in forehand having less power and stability and thus suffering? And although he never seems to block, this grip of his i found, is wildly unstable for TPB blocks.