At our school, Stance Set 1 is on the Orange Belt chart ~ required for promotion to Purple belt. If a student is attending a "normal" class schedule, they will be taught the Stance Set near the end of their first year of training.
Prior to learning Stance Set 1, the student will have completed Short 1 and Long 1 (Neutral and Forward Bow stances, mostly, right?); the Star Block Set (Block Set 1), and Striking Set 1 (Both of which are executed from a training horse).
At the same time as the presentation of the Stance Set, the student learns Short Form 2 and the Coordination Set 1. Short Form 2 introduces the Cat Stance, and the Kneel Stance.
The Student does not get introduced to the Twist Through Stances until Long Form 2. And, the next Set learned in our studio, is again, a Training Horse Set ~ Finger Set 1.
Our school runs a slightly modified 16 Technique per Belt system. Each belt level also requires a Form and one or two sets. Placing the upper body isolated Sets first does make sense. Most students are going to have challenges co-ordinating the upper and lower body in their earliest days of study; even if they are introduced to the idea in the forms.
You ask why the study comes so late in the curriculum. I would suggest that we look at the Stance Set 1 (and in our school the accompanying Coordination Set 1) as the culmination of the students first year of study. It is their promotion to the middle belt levels. (Although this argument is equally valid at the end of Purple, I suppose).
Again, let's take a look at "1" sets in the curriculum (alphabetical order).
If you try to arrange a logical order for these sets, when dealing with new students, the one change I might make, is to have the Finger Set before the Stance Set. This would put all of the upper body Sets before the lower body Set. (Just as there are no kicks until Long 2). However, the Finger Set teaches us the "inserts" in the system; I suppose because of this 'sneaky application' factor, having it as the last isolated body set does make a little bit of sense.
- Blocking Set 1 - upper body movement
- Coordination Set 1 - lower and upper body movement
- Finger Set 1 - upper body movement
- Stance Set 1 - lower body movement
- Striking Set 1 - upper body movement
From that listing of the "1" sets ... why would you put the Blocking Set, or Striking Set after the Stance Set?