Usually one-shot cover stories arent of much importance but occasionally some plots or characters are revealed or hinted at in them. In 794 cover doflamingo gives his shades to a real flamingo but we see him STILL covering his eyes with one hand and using his puppet master move with another. Is Doflamingo blind? Does he have sharingan?!? Why are his eyes being so carefully hidden? Previously I'd have said it was just coincidence, but this cover page is pretty compelling evidence that there's a secret about his eyes.