One Piece Episode 450

[Sentenal]

I wasn't talking about the prison levels. I was talking about the simple fact that an imprisoned mofo is a timebomb waiting to be freed whereas a dead mofo is nothing but a name in a history book.

Level 6 is full of people who had their names erased from the History Books, though. There were tons of cages and stuff down there when Luffy was there, so you can't exactly make the claim Level 6 was empty or small.