To swing the way that Matthew describes you need all the swingers components ( or jigsaw pieces)... standard wrist action leads to right forearm position supporting loading of 2ndry lever (right elbow pointing more down)...leads to quarter turn rotation of PP3.... leads to pitch elbow (more readily)... etc
If you swing but use single wrist action then you get no quarter turn PP3 loading etc...still swinging because drag loading but using a component more typical of hitting and simultaneous release... all other swingers components can then be added but it is not as pure swing...
I am sure that Comdpa has written somewhere about the type of hinge action being determined in the backswing... it seems that the more turn to plane occuring in the backswing the more readily one horizontal hinges in the impact interval region.... and vica versa...
Just a few thoughts... shoot it down if you think i got it wrong ... looking to learn! Thanks