The real answer is that there isn't a PSIA "style". PSIA doesn't use a final form type of skiing and hasn't for many years. What PSIA, in my division, is looking for is the use of the "skills proficiencies" or skiing fundamentals. When we are asked to do a drill, a stupid human trick, or ski a scored run, they aren't just looking at how you "light up the mountain" or pivot slip your skis. They are looking for turning movements originating from the lower body, pressure management along the length of the ski, pressure being directed from outside ski to outside ski, pole plant, vision, and upper body facing the intended direction of travel ect... I haven't thought much about this for several months and this is a partial list from memory late at night.
In my case they don't see enough upper/lower body separation and called me out for a tendency to start my turns with an upper body rotation. It's the JH local style and it works very well in steep terrain with variable snow, but it is not as efficient as starting turns from the lower body. I believe that my "problem" is that I follow through too much at the end of my old turn and then must move my upper body to have my lower body in a position to start my new turn. Upper/lower body separation also lends itself to more effective angulation, edge grip, and lateral balance. I always skied better in the steeps because the steeps require more upper/lower body separation and angulation to keep the pressure over the outside ski. I don't ski a lot of hard snow surfaces and don't get spanked too much for being under angulated on slopes that have lower angles. Skiing faster will help hold you up if you are over-inclinated and under-angulated, when you slow down in this position you topple over to the inside.
So a person, especially an athletic person, can ski pretty strong and fast and get down some pretty hard terrain yet still have too much pressure on the inside foot, use upper body rotary to initiate and/or finish turns, and bank their turns. This person will not pass a PSIA exam no matter how much they "light up the mountain". I have never met an examiner who didn't like dynamic skiing. I see no need to dial it down for an exam. Certain tasks like wedge turns aren't meant to be dynamic. Your skiing should be appropriate to the task, just like you should not be carving arc to arc while teaching a level 3 lesson. All of the tasks and all of your skiing on exam day must show some level of each of the skills proficiencies to the standard you are testing for. I think I could pass the L2 skiing test on a well below average day, but for L3, I just don't show enough of what they want to see in certain areas. There is no official style or finished form even though we talk sometimes as if there were.
I think Zentune did well because he has good fundamentals that show through in all of his skiing at least at the L2 standard he was testing for that day. If his skills are solid enough, he will cruise right through L3 as well. Deficiencies like mine are minor enough to pass the L2 standard, but tend to show through from wedge turns right through dynamic parallel and are not good enough for L3. My guess is that when Zenny dialed it down he started to not show his solid fundamentals as well. Most people who see me ski don't notice my deficiencies because I mask them well. They are not hard to see with a trained eye.
Thanks, that was what I was looking for. There is no style, just a difference in movements. Some of which will work better for certain things, and some which will get in the way.