I was at least expecting a "Maybe we're cousins." only to have kara look off to the side and mutter "No, my cousin is someone else."
I know nothing about Mon-El from the comics. Either after my time, or only showed up in books I didn't read (like Superman). I do remember that Daxamites first discovered their not so unique powers during the Invasion crossover event where the Dominion was introduced. Only a couple episodes away from the Dominion crossover event, wonder if we'll see more Daxamites.
e-