Animation Retargeting Setup - One Rig to Rule them All?

That is correct.

On the shared skeleton, you can show retargeting options and choose whether the bones pose is calculated from the skeleton or the animation.

I have multiple humanoid character models, some are taller than the others while others are shorter/stocky than the others. I know that animation retargeting allows you to use same animation files exported from maya/3ds max and use them on any rig, right? So if I make an individual rig for each of my characters (Do I have to? Can they be shared?). I only have to create the animations once for any one of my characters then just use animation retargeting for the other 2+ characters.

Okay, thanks for clearing things up.