Coming back to the topic in relation to the elements, "everything", Spekkio and the sort.....
Very rarely does "everything" ever mean "everything" literally. For example, when you say you want "everything", you cannot want happiness and want sadness, let alone want to have one thing and want two things at the same time. Whenever the word "everything" is used, you cannot assume every single tangible and intangible object or subject is being included. When Spekkio says Everything is based on the four elements in Chrono Trigger, he was not meant to be talking in relation to willpower and whatnot. Even in the slim chance that those WERE meant to be included, it does not mean elements are the only deciding factors for which willpower etc occur.
Also, with the point on different magic being made up of different chains of "S,S,W", etc... I don't think it can be simplified to be so easy to understand if we are talking about the understanding of the Chrono Trigger world, of course you may say so if it were based on the "video game" sense, but I see magic more as a infinite scale on which "elements" (out of lightning, water, ice and shadow) have variable strengths, assuming that magic is purely based on these four elements as Spekkio said.
If you understand what I mean, please help me clarify my ideas, or if you don't, you might as well question my ideals.