NOTE: This is a pretty lengthy read/rate. For simplification, skip down to the end paragraph.
Here is my point, do you think that the creators of Chrono Trigger intentionally limited the amount of magic elements to four to suit game play needs(not enough characters to reasonably fill the blanks, didn't want too big of a spell library ect.) and in Chrono Cross because they had more characters and a more powerful medium to tell their story, or for whatever reason they were able to create six elements?
I would say that ct is kindof of the odd ball here. Fire and water are fairly standard in most elemental systems. Light and dark are here and there. The unusual aspect of ct is to have wind acknowledged, but not a useable element. My theory here is their element system is combining several into the 4 used as innate elemental magic. Lightning is also 'heaven' and its counterpart is 'shadow' the opposite of heaven is 'earth', but shadow is not earth magic. Instead 'shadow' element is a combination of the other elements, but I'd still say that in effect it represents or contains earth to be the counterpart to 'heaven' Water also makes an appearance, but in two different forms, effective water and ice. Water is known for its free form, so to be utilized as ice, it needs a form that is solid, hard and rigid, much like earth. And wind somehow also fits into the mix.
Now CT is fairly heavy in philosophy and religion, so I think its unusual elemental system was designed to utilize japanese elemental tradition, but not be limited and blatant about it. CC on the other hand doesn't seem to have much thought into and I think it was thrown in to make the story 'work'
Having to merge a lost, and possibly not even existent timeline factor into your story is already a lame excuse, but having it shape the world and play such an impact on the end result weakens it more imo. This is evident by the ambiguity of the purpose and reality of the system. The incorporation of personal techs, lack of duel and triple techs and how monsters utilize the elemental grid system (which is supposed to be an aspect of technology) all leave alot of uncertainties to this system. But apparently its not just game mechanics, as there is a part in the game where Kid's elements are taken, so it is apart of the story (esp in how the elements have to merge to obtain the ideal ending)
My guess is that the thought crew for this went something like:
"So, we have a nifty point-attack system, but what are we going to do about techs?"
"Well, some characters will have their own"
"Yea, but its not going to be much of an rpg if the characters cant do more than attack"
"So, we give them magic, duh"
"Okay... so how's serge going to get to the End of Time? And does he even have the potential to earn magic? And what about the other trillion characters we have planned? Are all of them going to have magic potential to be unlocked by Spekkio?"
"Well geez, that sounds like a lot of work"
"Yea, it does. Screw that, let's do something easy"
Another element to this weak setup is the history of Zeal itself. They have elemental technology before they become consumed by Lavos. Part of this is found in the Vests that are scattered through time in the game. If zeal already had the tech, and discarded it, why need a non existent history to occur when the 'mastermind' already has the means to create such needed technology? Makes more sense to me to elaborate on an existing history than to make one up. Take this quote from the encyclopedia entry on CC's elelements:
Elements should not be confused with the four fundamental elements of the universe, which compose all matter. These four elements, described by Spekkio, are the basic building blocks of the universe, while the Elements of the Dragonians are more derivate forces that represent aspects of nature
A few things set me off here that indicate how faulty the 'Elements' are:
1) Derivate. A product obtained chemically from a raw material. So, the Dracs took the basic magic elements, which are the fundamental building blocks of everything, and combined them to make new elements? Wouldn't that just make shadow? Its already been defined as being a combination of the elements.
2) Taking the form of derivate, and turning it into derivative: imitative work of another person and usually disapproved of for that reason.
This is the definition I hadn't intended to find, but I found it humorous and oddly fitting.
Next, I turn to 'nature' Taking from wiki for its elegance:
Nature, in the broadest sense, is equivalent to the natural world, physical universe, material world or material universe.
So nature = universe. So this whole derivation difference and whatnot is essentially a load anyway. The patterns and forces that make up and control your universe are effectively your 'nature.' In another take from the CC elemental article, its cites project Kid's use for the elements, in needing to combine them, and then add a 7th element as the means of repairing the torn dimensions. Well, if fire, water, lighting and shadow make up and effect all matter in the universe, and a dimension is comprised of matter, then we essentially get the same results from combining true magic as opposed to the fake ones. Which leads to my above conversation. "well damn, if serge can't use magic, how are we gonna make this work out?"
So, assuming the plot of CC
had had to be that way, ie, schala is forcibly merged with Lavos to create a being capable of destroying time, and needs the unity of nature combined with a dimensional element, why not just have Magus do it? Instead of saying "well damn, Magus is too badass for this story to work with this lame setup that we have to improvise on every other scene" create a game like Radical Dreamers thats mostly text based, has Magus (guided by Bathasar) manipulate time/space sufficient that it places him in the DBT, combine his magical prowess, toss in a dimensional fabrication (if even needed at this point) have have Magus forcibly pull Schala away from Lavos with the additional powers of love and peace (which transcends everything anyway) and make everything right in the universe, particularly since you have the man who is supposed to be doing everything in his power to find his sister actually do so. Happy, non ambiguous, ending. Woot woo.
NOTE: End paragraph here.
So long and short of it is, based on what I read from the article posted about elements in Chrono Cross, I'd say that the system is mechanically driven as a story obligation, or in longer, but simpler words, it was necessary to tell the story, but because Chrono Cross can't use the same system as Chrono Trigger, (for story consistency and more,) they came up with this setup. Just another reason why I say CC can be fun, but it could've been a whole lot better.