Responses

wait . . . that sounds confusing . . . let me explain.
Some of the users wouldn't have had OFA very long before they died. Like it wouldn't have been for example 100 years that passed before they passed the power along. So it would be possible to have had multiple ppl who would become users of OFA alive in the same era.
I think we all assumed that the 1st One for All user was passing the quirk down different eras but the 1, 2 and 3rd users of One for All all lived in the same era, neat!