Meteor Man doesn't actually conflict with the internal established rules for how Elf and Human physiology works. It's an apples and oranges argument which is literally what I was pointing out here.
Just because Apples don't have to all look the same or be a single color suddenly mean they can become Oranges. There are still rules in this world that are establishing a difference between Meteor Man and any other race we've been introduced to so far. There are still rules that apply to even Meteor Man, we simply aren't aware of what those limits would be yet.
Just because Meteor Man exists doesn't mean Elves can suddenly fly, make sense?