For the excalibur can't be 2-A it's tell where? It's excalibut that have kill the sefar that one on earth (not the weakened onre) + we haven't see a fully unsealed excalibur even more not one that have the boost against alien treat againt the world
Holmes: ''Yes, concerning the destruction of this planet. To start with the conclusion, that is actually possible."
Da Vinci: ''Wa-Wait a second, wait, wait! That is impossible! With the Safety system that this planet possess, it is not possible for this planet to be destroyed completely."
Holmes: "Certainly, that is correct. This planet that possess a continuous history has overcame many dangers. Putting aside the inhuman beings that came from the outside (space), destroying this planet with something that is born from the inside is close to impossible. That is why, to destroy this planet, first you should overturn that basic concept. That is, something that the Lion King tried to do. And then, what that Edison tried to do using the power of the Holy Grail."
So, you have to assume A) Excalibur > Rhongomyniad being used by a Divine Spirit, B) Excalibur > Holy Grail, C) Completely disregard Ea being the strongest NP or say Ea is 2-A also, D) Multiple that by a billion times a billion and then by infinite times, as an attack that could damage the planet is like 5-C at least, and between 5-C -> 3-A you have a 10^60 gap, and between 3-A to 2-A literally infinity.
Yeah, that makes a lot of sense...
Let's completely disregard the fact Velber has a skill that says they are essentially immune to 99% of attacks (spells) and can only be hurt by brute force magical power, which explains that completely and doesn't require absurd^infinite level of assumptions.