On the argument about Ea... I admittedly am leaning towards Regis' argument here. Not completely, but the point is valid. Unless Ea has specifically destroyed a physical planet, I personally can't accept it as a physical planet buster. Sure it works on a planetary scale, but in terms of raw destructive power, it's never actually destroyed the physical planet.
Nasu, and by extension every Fate-series writer after him, has a really bad habit of using the word "World" when referring to the established planet-wide Reality Marble. He makes it a point ot differentiate "planet" with "world", in that the former is exactly what it sounds like, and the latter is whatever Reality Marble is relevant at the moment.
To cite the same text that Repp did:
"The entire universe that had been compressed beyond limit focused around Ea, and was released by its wielder's slash. The resulting pressure wave sundered the nearby space. The World itself was sucked up by the chasm of the Void, and turned inside out. Who would believe that this scene was caused by the swing of a sword? The Void emerged from the chasm, rupturing space further. The World eroded, giving way to countless fissures in reality. The sands cracked like clay. The sky and clouds were shredded like so much paper. It was a hellish landscape, as if a painting of the desert had been thrown into a blender. The "slash" of the sword twisted and tore the planet, sending a wave of destruction at the Heroic Spirit standing on the ground."
This is flowery language. That the first sentence mentions the entire universe being compressed and focused around Ea makes it clear, since Ea is explicitly not galaxy-level, much less universal. This is on the same level as the final battle of EOR3, where Musashi and Kojirou were described to fight for an eternity with their slashes numbering infinite, when all that was really happening was a really intense exchange between two evenly-matched swordsmen.
Quoted directly from Fate/complete material II:
"The space-cutting technique fired from this overloaded state is called "Enuma Elish", and boasts destructive power on the same level as Excalibur."
The destructive power is one thing, separate from the ability to unravel the World (Reality Marbles) to reveal the Truth (what's under the RM, in Gaia's case, the physical planet). The Anti-World designation is granted based on the ability to dismantle Reality Marbles, not the ability to bust a physical planet. It also explains why Beast II had to be weakened even after King Hassan destroyed its immortality, before Gilgamesh brought out Ea; as opposed to just pulling it out as soon as the immortality was gone.
Frankly, the only in-universe people to actually describe the effects of Ea through narration or dialogue are people who can only go by what they've seen (Shirou, Waver, etc.). Da Vinci explicitly states, while referring to a key plot point in EOR1, that no NP can destroy the planet, even those designated as Anti-World. Da Vinci, along with Romani and Sherlock, are the people used to deliver information that explains in-universe events; so their words hold a lot of weight. Hell, Goetia flat-out states that Ars Almadel Salomonis can only manage to pierce through the planet, as opposed to blow it up.
While I'm fine either way, in the interests of accuracy to the lore, I don't consider Ea to be a planet-buster, as opposed to just having planetary range for its effect, unless someone can refer me to a time that Ea explicitly destroyed a physical planet.
