Obviously yes to the last one, I suppose, if you're throwing a backup ball. If you can make it face left, towards you, while standing there, there is no reason you can't learn a standard hook.
Yep that is what I was thinking. I am also thinking he has a stretched span and a ton of reverse pitch causing him to squeeze the ball and torque his elbow.
Allen, if you turn the wrist over you aren't doing it right anyway.
I am fairly sure I could have you throwing a normal hook in no time if you are willing to travel down to the Washington DC area, you can stay in my guest bed room.