DT
replied, he has stated the following, that attack energy ≥ creation energy should suffice, it doesn't need a strict >.
He also stated if a creation feat was casual, then an attack spell that is exhausting the user should scale. And if casual spells of them are somewhat comparable to those that are actually hard, then they would downscale to some extent.
But he hasn't replied to the situations where both the spells and attacks are shown to be casual without exhausting the character too much, but he has stated the following:
"But let me say one thing, just to make it clear: When we are talking universal energy systems we always have to clarify universal to what. Like, when we talk about a universal energy system regarding creation feats then we usually first and foremost mean that the creation feat and any kind of magic is comparable. It has nothing to do with scaling physical stats (i.e. Striking Streng and Durability), but only with scaling AP.
We also sometimes talk about universal energy systems when it comes to scaling supernatural Attack Potency to physical stats, but that is a separate issue, although in terms of mechanics of course similar in nature. A universal energy system that allows scaling supernatural power to physical stats doesn't necessarily allow scaling creation feats and vice versa."
As a result I've asked for a bit more clarification on this with regard to striking strength and dura (And most likely AP in general) involving situations where character casually breathes an object into existence and then using the same energy sources he amplifies his physical stats to punch, kick, shoot energy blasts and so on with greater intensity without much exhaustion, and how our guidelines would help mitigate this.