There is no resisting at all- 0%! You make it sound like the harder your shift the more your hips will rotate. So not true. One can only turn the hips if he initiates that turn during the lateral shift. It's a dynamic turn- it doesn't all of a sudden happen.

The idea with spinning the top with the backside of the shoulder is to create enough torque by the torso to powerfully turn the shoulders which lag behind. We are after all whipping the arm with rotational Force aren't we?

From the full reach back
1) Shift weight/butt/hips linear toward target
2) Plant lead leg
3) Turn hips around plant

Also note his comments about one leg drill in the video.

The more powerful the lateral shift becomes, the more momentum there is to brace against. This directly increases the power you can send up the kinetic chain.

Not if you rotate your hips first.

Exactly. Just sitting here thinking about it...

If rotation is believed to be the engine of the power, the mentality of the swing is to begin rotating off the back leg with the spine as the axis. Won't the action of swinging your arm out from the axis actually slow the movement down from when it starts until the hit? I am not 100% sure on this, and would love to see real scientific data on it.

If rotation were the ideal goal, I believe the swing would be more like a 360. People would do something like a figure skater spin, bringing it all 'in', then eject out of that?

Ummm... That's the whole idea- to create a lot of rotation. Bringing the disc into your belly/chest increases the spin, that's why you do that and then you eject it out.

I see it more as
1. Keep weight back, butt pointing forwards/ hips facing more rearward
2. As the lead leg comes into plant the hips start rotating into brace, shoulders stay turned rearward
3. Brace, continue to rotate hips which rotate shoulders and bring disc into body
4. Accelerate rotation and eject disc.

I don't do that, at all. My swing is getting wider if anything.

By "wider" do you mean the disc is further away from your body when it's in the power pocket?

Let's see a video.