Should back elbow and front elbow maintain same distance into swing launch?

[Cornbread]

And if so, what are some teaches. Does back elbow control the hands or vice verse?

 

[Rolling Hard]

Somewhat, and on a slightly inside pitch they may remain the same thru contact. Hands and elbow work together. They are on the same team.

 

[Eric F]

And if so, what are some teaches. Does back elbow control the hands or vice verse?

I prefer to think the hands are in control.