I wouldn’t even call Wonder Woman magical. Given the sense she doesn’t really cast spells or dip into the arcane herself outside gear. But even then.
You could honestly even argue outside magic that Aquaman can classify on the top of a Eco-list of heroes name a character who is as connected to an element and is as popular as Aquaman. When you think of a water superhero it’s commonly Aquaman and a lot of movements to protect the sea when they’re tied to a comic character it’s Aquaman. I’d argue Aquaman is the face of a list of characters who are more about the environment, or even elements. Swamp thing, Vixen, Animal Man, The Sea Devils etc
Regardless of that I think Bat39’s point of why Flash is 4th was the best explanation for Flash and I can’t disagree Flash is more significant to the DC Universe lore wise then Aquaman is. Honestly until recent attempts to put Wonder Woman at the forefront I’d argue you could even say atleast inside the DC universe Flash is more integral. It honestly all depends in my opinion on how we’re deciding the fourth pillar though.