This hips/shoulders make the same amount of turn as the feet, but they tend to neither start nor end in the same alignment.
Consider a 123 of a natural turn in waltz, commended feet LOD and ended feet backing LOD. Typically, at the start the hips/shoulders will be closer to LOD, and at the end they will be backing closer to DC. This is the same amount of turn, but between different endpoints.
During step 1, the CBM is accomplished by making most of the total rotation of the hips/shoulders, before the alignment of the feet has changed much at all. during the later part of the figure the feet make all of their turn, and the body turns a little more.
In terms of alignment, the hips/shoulders lag the feet. But they make the same amount of turn, and the hips/shoulders make the turn that they are going to make largely before the feet do.
If you actually read the book in detail, the starting and ending alignments for the hips/shoulder are the same as for the feet. However, the book considers the exact instant when a step starts or ends to be later than you and I would by feel. If you are standing there ready to demonstrate a figure, you are not yet to the official start of it, and so your hips/shoulders do not match your foot alignment. If we snapped a picture of you during the course of the demonstration at the exact formal start of the step, then everything should be aligned - but it's a very brief instant as the hips/shoulders on rapidly changing from underturned relative to the feet to temporarily being ahead of them in the turn. Similarly at the end of the step - which is really the start of the next.
