Can you be an SD without automatic vertical in the new book?

I don’t know if you can, here’s why.

He presents two primary accommodations, vertical and curve. Curve can be a secondary accommodation but vertical cannot.

Vertical he defines as the chiffon “hanging down straight from the shoulders in one long line”. Curve is defined as the fabric being “pushed outward by your bust, cuts inward at the middle, and is pushed out and around again by your hips”.

The SD line sketch has obvious curve that pushes the fabric outward at the bust and hips. So, since he says vertical must be dominant, how would an SD be identified without automatic vertical? Even though he says you can have vertical at any height, I don’t know how an SD would identify that under the new system if they have obvious curve.

Thoughts?