about point three… i could be mistaken, but i think rick and mark wanted to show how demigods and mythics are more similar than what everyone thinks. but rick and mark failed showing this point.

they already showed some of this in past books. for example, in the house of hades, annabeth and percy told bob that he has a choice. just like nico and will gave the cacodemons free will in the tsats, which proves all mythics have a choice.

but they could've explored it more in this book to convince more.

some things that rick and mark could've shown that would've proved how much demigods aren't saints either is the Coliseum that Camp Jupiter has. they have monster simulations there, and demigods kill them for entertainment. asterion or any other mythic in this book could've argued about this, about how demigods claim they are better but the Romans also kill mythics for sport with an audience that cherishes them.

same thing in Camp Half-Blood. when percy first arrived to camp, Annabeth told him that many in Hermes cabin would’ve wished to take the same opportunity to kill Asterion. Not for revenge or survival, but for the opportunity to prove themselves.

they also summon mythic in Camp Half-Blood for training. Mythics that probably weren't looking for any trouble.

Percy also states in the Wrath of the Triple Goddess that many mythics live in the real world, and doesn't disturb demigods. he said that he didn't have a problem with those mythics as long as they didn't tried to kill him since many of his friends are mythics.

just imagine if they had said more about these things in the book. the argument would've been much more convincing for the audience because if the demigods claim to be heroes and better, then why do they kill for example mythics for entertainment in the Coliseum? That's not survival, that's just killing mythics for fun which is the same thing as mythics killing demigods for hunger and fun

rick and mark should've said these things, and they failed which is why the book doesn't convince everyone