Johnny is using his Brother, Nicholas, boots on the flashback! 😭
Johnny.... ;-; you sacrificed yourself for your son... you glorious man...
And makes sense: The power of the Full Corpse is to transfer misfortune to another place. Araki didn't forgot, it seems...
My theory is that the Corpse parts wasn't taken away by the American Goverment. It is still in Morioh! They must be, otherwise, why people are getting Stands?