Gyomei is known to be the strongest Hashira in Demon Slayer in his era. He's a blind man and unlike other Demon Slayer members that use blades, he uses a chained flail and an axe as his main weapon. He's known as the "Stone Hashira" and is very strong (physically and mentally) and is a very kind individual. Me personally, I feel as though he'd have every type of Haki while also having some advanced forms of Haki. He'd deff have advanced armament Haki and I could see him being a conquerors user with also having advanced conquerors. My question is would he have future sight? I'm not to sure if it's possible for a character to see the future while being blind so give me info on this topic? If he can't, then I'd see him having insane basic observation haki similar to Shanks or Fujitora.