I'm finding a lot of interest in the concept of both Aquaman and Wonder Women being of Kryptonian decent. This made me think on what this would mean and how they could, try, to keep the original concept of each character at heart and connect this with the realistic realm that Snyder created.
I would prefer their very own origin, of course, however if this is a running theory, why not grab that baton.
The key points I noticed from those who wanted to shoot down this theory in their own civilized way was:
1: Issue with them having all the same powers as Superman.
2: The Loss of the Mythology.
OK, so if we are dealing with a civilization that colonized thousands of years ago on Earth, then we can assume that generations over time had to adapt. Imagine the issues they had, much like Zod did, that may have caused the founding members to alter their genetics to better adapt to their new home. Before they created more Kryptonians with their matrix baby maker, they could have easily prepared the next generation for Earth. This will explain why neither will have all the powers Kal-El will have.
I'm keeping with this theory for both cultures, however Atlantis has a different taste. Atlantis is in the depths of the ocean which means less sunlight. As generations pass, this lack of the yellow sun may change the abilities of the colony. And again, if they have this control over genetics, they can alter some genes to better suit their environment. Such as breathing underwater or even unlocking the language of the "intelligent" sea creatures. We taught sign language to apes and have unlocked a lot of Dolphin mysteries in our short time on Earth, imagine what an ancient ANCIENT culture could do with the technology available to them. They've been alive for sometime, according to Dad (Jor-EL).
This then supports and maintains the abilities that both Aquaman and Wonder Woman have in the comics and doesn't make them equal to Superman.
Mythology would be there no matter what. Even if these civilizations altered their make up to better adapt to their new home world, those powers exist and ancient people saw this.
In ancient times, when we had no clue how the sun works, if we see beings/aliens that can lift anything, some fly, laser eyes, cold breath...we're going to make them into gods. Just as we're seeing in this new movie, the world is split on what to think about Superman. In ancient times, we didn't have social media, concepts of sciences or life beyond the sky other than gods. So Krypton's children would be held to those standards.
Greek gods also mixed it up with humans, why couldn't these Kryptonians do just that? Perhaps in doing so, created these two nations of hybrids, thus explaining also why their powers would not equal a pure bred Kryptonian. Maybe only the actual Kryptonauts (?) survived the crash and never utilized the matrix to spawn the following generations and the outcome was just interbreeding between human populations.
Again, I am just rationalizing the concept presented with this theory and I believe it would be interesting for a colony of Kryptonians hiding on Earth for centuries and surfacing after the events in Man of Steel.
I agree with majority, that the original background would be something fans of either characters want. I support that view, but if this is the way it goes, this is how I would explain the differences of the cultures, the powers and their legend.