Well, that is why its a challenge.
However lovehurts, in FFVI there are still attacks that do alot of damage regardless. Many attacks that break through defence (Throw, Tools) and Gau's Rages which can offer power not normally available for the time. And not to mention MBlock raising uber-equipment.
Although it'd be awesome to see a CES challenge with these same requirements...
I have faith in nik, even though I too think its pretty insane. Still, he freaking beat Omega Weapon in that one FFVIII challenge, jesus.