Hahaha. Rex's thirst for knowledge is on par with Thomas, or even greater given what we've seen here.
Frankly, in fiction, wizards working in tandem always had an exponential effect rather than a multiplicative one.
Also, in response to Rex's atomic magic questions, imagine the difficulty of creating, memorizing, implementing, and activating a spell that is capable of 100% altering the structure of a substance that the characters have no concept of the atomic structure of? While on paper it seems plausible (which is the bane of every scholar of anything ever), the act itself is a tremendous undertaking. Now imagine trying to get multiple magic users to do this not only in sync, but with a 100% efficiency in their reproduction. You would not only be risking your own life, but that of every magician that attempted the spell, for only a minuscule chance at success.
Well, that is if I'm understanding this correctly, which I will admit that I most likely am not. Regardless, this could explain while certain magical fire spells can harm people, but not light the surroundings on fire. They're missing the fundamental equations in their glyphs that would allow them to create a "perfect" fire.
I think we should just stick with the "most magical glyphs originate from a more advanced society that had a greater understanding of the subject matter, and the current world is just trying its best to peice together the mysteries" approach.