A rock fact? No...a little ratting? Maybe...
As a person who is in many Bleach groups on Facebook, I have come across the top ten of the Bankai and the zanpakutos; Kyoka Suigetsu is always pointed out in those rankings as the most powerful and that he will have the best Bankai when it is revealed, blah, blah, blah… But to be honest, Kyoka Suigetsu's ability is only to hypnotize the enemies of the user, to make the opponent believe and see things that aren't; Aizen mentions it once, with the example that he can make a person see and feel a simple insect for a dragon or something.
But (And this is my personal opinion), the real reason why Kyoka Suigetsu looks so dangerous, is thanks to the person who has it, who managed to get the full potential of this sword, and who managed to use every attribute of this weapon for his own benefit; Because let's be honest, if someone else didn't have the same level of reijatsu, manipulation and cunning as Aizen does, this weapon wouldn't be in the top ten.
