Roger and WB also didn't have FS. Roger and WB being the strongest characters doesn't mean they had every ability. There's likely a specific way to make a black blade that roger and WB just didn't know/have. There's only 2 that have made black blades in history of op. I don't think that it's over rated at all.
I guess we’re going to pretend Ryuma doesn’t exist.
I guess we’re also going to pretend Kuina doesn’t exist.
I guess we’re going to pretend that Ryuma is the first character in the series with a ‘god’ title. Or that Oda has been subtly hyping the Shimotsuki plotline in SBSs and hints towards Ushimaru in Yamato’s backstory.
But yeah fuck man, Oda clearly doesn’t give a shit about swordsmen.