I edited my post.

Also, I do not care about the difficulty, I care about whether it is valid or not. If you cannot use Tidus in a Tidus only challenge, then the design is flawed, and therefore is not an actually challenge, just someone who THINKS he can do a challenge with something that is not a challenge in the first place.

EDIT: If it already has been done, then why do it? To prove something? No one cares. You prove nothing except that you know how to waste time.