Whoops. Didn't read the first part of the topic. My bad. (Kirby really should be on this list, though...)
From this list... It's between Sora and Kratos... I think it was kinda pointless to include Cloud, since Sora defeated Cloud, didn't he? And... At what point exactly did Sora kill a god? I can't remember. Been a while since I played the KH games... Also, why put Sora on the list, since Xemnas is obviously more powerful. It did after all, take the efforts of both Sora AND Riku to take him down...
However, Kratos still wins. You say Kratos lacks speed. So did Hermes. Look what happened...