Limpinhitter
G.O.A.T.
Hey Limp ... I am not understanding your distinction between a slice vs a chop. For example, a common element I see on all of them in this thread (Rosewall, King ... Fed) is the hand going from high to low to some degree by contact, and hand going below contact after (King just a little). They vary from Graf straight arm on take back to Rosewall and Fed bent at elbow and then extend to contact. Are you talking about different strokes are a matter of degree?
For example, I have seen the Rosewall video where he follows through more forward then across. But in this video, it looks kind of like Fed other than racquet face angle. It seems like you have to come across if you want the side spin also.
See my descriptions in posts 10, 25, 30 and 37. The Rosewall backhand in the video you posted shows the elements I described, and is clearly significantly different from Federer's backhand.