[ Thus, the only safe assumption until any other evidence is introduced is that all scenes have been portrayed accurately.
A nitpick of your nitpick: There IS precedent that when a "story" is being told, there is illustration of that in-comic, which is not necessarily carried out within the unfolding events. Specifically, look at Vinnie's "illustration" when he describes the TV plan to pair TV warlords with Archons, using dance fighting to boost their power and ambush Stanley and his FAQ-bound forces. We know that although the illustration showed the Archons and Warlords dancing together, in actual practice the Archons were not available and Stanley ultimately escaped the trap, having faced only TV and Jillian's forces.
Carrying that precedent to the current debate point, the idea that possibly the "story" of the Titans creating Erfworld and leaving one extra gem behind, and its effect on the Battle of Warchalking, would logically show that it could merely be a "storytelling" event, in the sense that atheists believe faith-based creation stories are nonfactual tall tales. On the other hand, it could be as you say, a simple laying out of the actual events in context of story setup. There is simply no information at this time to determine which scenario we are looking at. The fact that the opening narration before the "entrance of a main character" scene, in which we are introduced to Wanda, happens to be all in quotation marks muddies the waters considerably, imo. The presence of the quotation marks makes it seem more as if it were a story being told, as opposed to a third party perspective of a scene unfolding. When the narration seems to be a possible first person view, the scene unfolding is much more ambiguous in character. Since we haven't been introduced in-comic to this possible first person type narrator, we have no way of definitively saying which it is, in either direction.
Personally, given the real presence of the Arkentools, and the "fact" that they are sentient in some way, according to actual Voice of the Titans, I lean more heavily to the camp that believes there ARE Titans, and they ARE (or were, for that matter) Elvis impersonators that created Erfworld and all it's mechanics. Makes as much sense as anything else, and is considerably less taxing on my tinfoil hat maintenance fund, not having to come up with "what if Parson is the real Titan!" theories.
An addendum to another debate thread going on- The usage of Vanna's "turn" term. My first reading of the comic led me to believe she meant juice that had been saved for two turns. But I am quite willing to believe, now that it has been pointed out, that she meant "the juice that it would take to turn two different units". I think either theory is equally valid, and the idea that she was "low on juice", even after having her juice refreshed at turn beginning, wouldn't actually affect the debate in either direction. After all, she could have had her jucie refreshed, and then had it depleted by the act of disengaging the link.
Since Charlie and Vanna were linked until after the turn for RCCII had started, and ended the link shortly thereafter, the state of Vanna's juice is no predictor of..well..anything, really. My pet theory was that the Kingworld spell's juice cost was paid for by the Arkendish, given that the Arkenhammer and Arkenpliers seem to have no discernable juice costs to speak of, either, but it's quite open to interpretation. For all we know, it cost no juice from Vanna at all, and her juice was depleted by Charlie having her do another spell, after the turn had started and before they unlinked. Hard to say, and tbh not worth the debate, imo. It's unlikely to be addressed specifically ever again, and "knowing" one way or another wouldn't enhance or detract from the story as it is. And, as I said before, my tinfoil hat maintenance fund is subject to far too much depletion as it is.
P.S. Taking donations for my tinfoil hat maintenace fund! (Thinking about adding new earpads...)