Yeah, as shown below not really holes. I was thinking of it from a lore perspective - Noctis' line, or at least those blessed by the crystal and their immediate associates, are supposed to be the only ones capable of doing that weapon trick. Aranea is a mercenary in Niflheim's employ, unconnected to the crystal, and even has a different colour from both Noctis and probably Ardyn when she summons and dismisses her spear. Ardyn could have shared his lower like Noctis does with his companions, but that doesn't make any sense any way you look at it. Of course if you look at it through the FNC lense, it makes perfect sense - she's just unlocked her human innate potential naturally without divine prompting, and being who she is doesn't advertise the fact. And Ardyn simply chooses not to reveal it for his reasons. But then, we're not supposed to connect XV with FNC anymore, so... big hole in the lore. EDIT: Explained reasonably below.