I think we're going to hit hairsplitting on this one, because of how we use the words. But to me, Style is technique combined with philosophy. It's the movements as well as the methodology. Let me be clear, I explicitly agree with you in my paper that the first four forms are combined in the way you're speaking, especially in consideration to the Marks of Contact, but they also exist separately and of their own accord.
Yes, we may be getting into hairsplitting. I am of the belief these hairs need to be split. And I do agree that none of our system precludes someone training in just Shii-Cho or focusing on Soresu. The two are not mutually exclusive.
Shii Cho has elements of the other forms. Yes, but that's not the whole of it. It's a siege engine. It's straightforward burst of carnage, never retreating. It's constant moving forward attacking multiple opponents. Makashi focuses more on linear precision work, like a sniper rifle. It picks it's spots more closely, works the opponent into a position it favors. Soresu goes for clean and decisive hits, using patience and waiting for the right strike while Ataru's style focuses on barrage until something sinks in.
While we differ on the details of what the forms represent, I do agree with the spirit of what you are saying.
Again, I agree with you that Shii Cho has a kernel of all these things, but it has a life and meaning of it's own. Each one CAN be used of it's own accord. Doesn't mean it should. But it can. I believe in building them separately, to show clearly in my mind (let alone the mind's of others) that THIS is essence of the form, and then start focusing on blending.
Here is the point of it all. Ataru CAN be trained in isolation. If it is it must meet the minimum requirements to prove effective to the wielder. It cannot be USED in isolation any more than you can use the skills you learned reading Sci Fi in isolation from those you read romance with. That's where reality conflicts with popular notions.
ANY system of martial art is just a training regimen. I believe I have touched on this before, but the idea that we "use" martial arts in fighting like tools on a belt is not true. We bring all of our skills to each fight. If our training regime is not complete, or too limited, we either have to come up with novel approaches to solve those problems or look to other training methods to see if there is an existing solution. The first four forms form a very nice historical and technical evolution. (I am aware that these are plot devices used in story telling, but as Ulios has said, we are reverse engineering this stuff.)
1. Shii-cho: Basic attack and defense with the saber. Used as a learning tool to introduce saber techniques. Designed for battle field confrontation (blaster fire and multiple opponents). This makes it simpler and necessitates it being easy to learn. Adaptable to single combat but limited in the techniques.
2.Makashi: Designed to be more applicable to single saber to saber combat. Trains a complete understanding of the mechanics of the weapon. Since it is mainly developed for saber to saber or one on one, we can assume Shii-Cho would still be used as the battle field training technique.
3. Soresu: a refinement of previous techniques to respond to a greater defensive need. It would be assumed that the inventors of Soresu must have developed it from the previous two.
4. Ataru: the same situation as Soresu. It is a refinement of technique based on perceived short comings in the training developed and/or combined with at least the first two forms.
From there you get the explicit mixers: Forms 5-7.