Well, the original Aquaman doesn't exist any more -- he's been gone since they introduced the Tom Curry retcon in 1959. And the second version's been gone since Crisis.
But that's not what you meant -- you're asking why it couldn't work with the current Aquaman.
The answer is -- among other things, the current Aquaman is the son of Atlan, the rightful ruler of Atlantis, a person spawned by magic, not an outsider to the oceanscape by any stretch of the imagination, and a variety of other factors that will become clear over time.
Plus, King Shark really doesn't like the current Aquaman much, after INFINITE CRISIS #3.
Friday, December 09, 2005
Why Not Use The Original Aquaman?
Kurt was asked: