All For One's brother is considered the first holder of One for All, after his transference quirk combined with a stolen stockpiling quirk. However, somebody often overlooked, is the person who got their stockpile quirk stolen.
Will this unknown individual ever be relevant to the story? Do they have any connection to the One for All power? As the transferable side of the quirk, seems to memorise pervious users, so would the original stockpile owner be recorded as well?