I'm not aiming for realism, for if that was true, among other things, I wouldn't have keyblades in my game. What I'm instead aiming for is believability, something you can't just deny. It's the work's believability that makes it enjoyable. Believability is a crucial part of the illusion of life, something all fiction strive for (whether their creators know this or not). Believability and realism are not the same thing, especially since the latter can actually hinder the former when done wrong. (Go see "if [your favorite work] was realistic" for examples.)

Besides, if I really was aiming for realism, I wouldn't had denied his character a second Karjamian Dimension Tunnel Device since realism dictates that's possible. (The real reason why I've denied it is because it goes against the team-based dynamic I had in mind for the game.)