Top wrist cocked to throw!
The top hand is the hand to pay most attention to regarding the grip. An important area to pay attention to is the wrist crease. The top hand wrist should be cocked much like it is just prior to release when throwing a ball. This is why the back armpit should be opened up to get that throwing feel with the top hand.
It doesn't have to be in the stance. It can be but it isn't a must. What is a must is that thing needs to rise during the load phase.
Call it back elbow up, pointing back, or what ever... It should happen for optimum results!
Some have been coached out of this action, some fight it, some can hit fine without doing it. I'd rather be a better hitter than just fine.
Plus, you'd never throw a ball while keeping the back elbow down. Just sayin.