You're not quite visualizing the draw correctly. The left elbow is held high- you're not reaching up for the zipper but down for it. With the elbow still held high you get a firing grip and pull the pistol back out and rotate forward. While it's in the KB it's at an angle, not parallel to the body but pointing downward. I wish I had a camera to record it and a way to post it.

As the gun clears the body and is extended to about 45 degrees away from the body you begin to "chase" it with your left hand. A little bit like the "natural clap" position but a bit higher.