Apoligies if this constitutes thread necromancy. I've dabbled in that foul art from time to time by accident, but I believe I have something to add to the discussion.
The idea of the Forms as presented by Publius is fine. But they make zero sense in the context of the movies themselves. They are said to define the way a Jedi fights, the sword techniques avaliable to said Jedi, the stances, usage of the Force, even the way they think in battle. This is not what we see. To put it bluntly, I must question whether the original authors of the Star Wars Insider article have ever actually held a sword in their hands.
To begin with, no two Jedi seem to fight exactly alike. The word 'forms' do not seem analogous to the forms (or kata) that we know - they seem to be different disciplines, but that's allright; a rose by any other name and all that. Be that as it may, we are informed of certain noteworthy practicioners of the different Forms, and a study of these should presumably give us insight into the common characteristics underlying the styles.
I cite the Insider article:
Insider wrote:Their lightsaber combat is astonishing to watch, filled with elaborate moves in the center of which a Jedi may be all but a blur. Yoda, with his deep emphasis on the Force in all things, is a Form IV master. Form IV was also the chosen discipline of Qui-Gon Jinn and the early choice of his apprentice Obi-Wan Kenobi.
Now, to an astute observer of Qui-Gon's style, a few things are soon apparent:
* Qui-Gon is very technically proficient. His style is very clean, and we can thus expect it to approach the central tenets of his Form. In other words, his Form should look as close to the ideal of Form IV as possible. Indeed, it is said in the TPM novelisation that Master Dooku once considered Qui-Gon the best he had ever seen - presumably he had performed some technique beyond what Dooku had expected.
* His style is not even slightly similar to that of Yoda. In fact, the only major commonality I see is that they both use green lightsabers.
* Yoda's style is as we would have expected - yet his motions are based on and centered in his ability to move in that unnatural fashion. In order to successfully feint in his fashion, Qui-Gon would have to be as fast as Yoda, and would greatly benefit from being small like Yoda. Thus, the Form that Yoda uses would be of limited use to Qui-Gon, who is quite tall.
* Qui-Gon's fighting is predominantly based on straight lines. Yoda's swordwork is based on surrounding the enemy with spinning attacks.
There is probably more, but I am too much of a novice to presume to comment. Instead, we'll discuss the stupidity of Vapaad.
Vapaad is supposed to be the form that Bulq and Windu use. The problem here is that Windu has a rather crisp style - sort of a point-to-point philosophy where he determines what he needs to do and does that only. He sometimes tries more difficult techniques, but he never breaks out into excesses to my knowledge. According to the text, he's supposed to be the predominant master of Vapaad, which is supposed to be most difficult of all the Jedi fighting arts.
Whereas Bulq... well, not to put a too fine point on it, but he's an idiot. The kick he demonstrates in the arena is among the worst I have ever seen. With that single motion, he demonstrates that he would have been instantly killed in any truly challenging engagement. He leaves himself unbalanced, drops his guard, prolongs a technique unnecessarily, fails to deliver any real force, and is just generally and quite horribly sloppy.
In conclusion, his technique does not show any of the finesse, dedication or talent that could be expected of a student of this "most difficult" of combat arts. But that's okay. Apparently, you don't have to use the same sword techniques, stances, guards or footwork to be a student of the same Form! You don't have to define whether two swords or one are on the menu. And so, in the end, we are left wondering just what a sword Form is.
The question becomes even more baffling when we look at that horrible travesty known as Form VI. Apparently, the Form has a deep philosophical connotation, like the other Forms. That would be fine for any Martial Art, as long as the concept was both simple and useful in its own context. "Basic" is fine, as is "Intricate swordwork", "Defensive", "Offensive", and so on. Problematically, Form VI essentially promotes "Balance". Had it been intended as balance between offense and defense, it would have been all right, but it is apparently not so. No, the essence of Form VI is painfully clear:
Insider wrote:This Form balances the emphases of other Forms with overall moderation, in keeping with the Jedi quest to achieve true harmony and justice without resorting to the rule of power.
In other words, it's "be careful". That's no way to fight; that's a recipy for disaster. It is, more to the point, no rational basis for a Martial Art. Which leads me to conclude that whatever the Forms are, they are not Martial Arts as we understand the term.
What are they, then? They come with a lot of philosophy, they include within themselves the martial applications of the Force, they teach how to use the sword but without any recognizable coherency or consistency, and are supposed to act as some sort of yardstick for how you approach violence.
I think the most likely conclusion is that they are some form of religiously influenced military program, and that Form VI is the easy course. Either that, or they are simply schools of thought, mini-religions or quasi-schools of philosophy within the Jedi Temple.