Gee golly, this got out of hand, faster than the pace in which the road runner aptly avoids his coyote pursuer each and every time the camera shines on him and his rocky outcrop of a homeland.
It seems I forgot to imply my old rule of 'put the most important detail at the very end of your post, because that's the one they'll remember and respond to.' Instead I put it in the beginning. I said I was fine with a 1-prep rule, however, however, under the circumstances given... Myron is in a magicked zone where time is incredibly sped up for him. Based on this, I assume it'd be stupid if he wasn't able to pull off at least one extra prep vs Corban's singular; otherwise what use do I have for such an absurdly powerful ability? Nobody seemed to join in on this argument... which was my most important damned question!
"What you want to do is quick-cast, but it seems you are interpreting quick casting as prepping." I... I... no, I'm not. I'm boggled that my words made you think that. I will now assess my language skills in greater depth.
I did say "One that is 'enhanced' and empowered over time?" When referring to preps, noting to my understanding of the system, but relative to how it's tricky when applied to every spell imaginable. I get what you mean by a prep, I'm just tugging on the puppet strings connected to its many letters.
As the argument progressed, I'm pretty sure the ultimatum I discovered was indeed the problem.
Myron is not capable of charging his basic runes with extra power, the power they contain is nearly always the same, unless grown to a humongous size, or altered with a plethora of additional runes. So if we say the process of writing the rune isn't the prep, because he can obviously write multiple runes at once, then he should indeed be allowed to write all the runes he has been with minimal stress, and several at a time. We can perhaps assume that his only real preps are supersized runes, enchantments, and in-depth idioms, which require multiple rune combinations, and thus, extra... what's the word... hmm... preparation? Yeah, that's it. I had in mind a rune that powers up other runes effects, I'll apply it to Myron's skillset so that he's capable of prepping minor runes.
Now last but not least, since I've stated myself as willing to accept T1 Eden rules (and I was in fact following them, don't get me wrong)... here's my real problem. I do not think every prepped ability should oust every non-prepped ability. Myron has some minor spells, like the barrier, which can essentially block many things prepped or not... but it wouldn't count as a prep, right? Logic, science, whatever the hell smart people use should be the go-to on attack effects. Extreme strictness of the rules perceived through outdated text, regardless of morality or common sense is the very basis in which the Templars and ISIS operates. Yes... I'm using ISIS to relate to this, in an attempt to make anyone feel bad if they argue or disagree with this final statement. I know, I can be a bit of a testicular vice-grip at times, I'm terrible... oh well.