Please, Kefka may be insane but if a band clearly weaker than Crono and gang could stop him, no doubt Croo could win. Although i will admit that be quite a fight, but the end results would be obvious.
As for the crap player, give him to my friend's little brother(about 4 years old). If he can make Fox in Melee lose to a level 1 Ganondorf, but suicide even though he got knocked off the side, and not the bottom, he can make Crono be killed by Gato. Now I'm curious what happens WHEN you LOSE to gato...
Perhaps it shall play the game over scene, fade to black, fade back in to gato standing before Lavos! And if gato wins, the ending will be starting off with the Crono's home, the soldier enters for Crono's awakening and then when the shades are opened gato sits in a blood filled bed, eyes glowing red, and starts singing an eerie tune... MWA HA HA HA!!!!