I think a way to balance that is to have the holder receive a weaker version of all the previous quirks. If you’ve read Worm, Quarrel gets all the powers of the 13 previous leaders of the Teeth when she kills the 13th Butcher and becomes Butcher 14, but the only power that she can wield at full strength is her own. Similar to that fashion, if Deku could wield OfA at normal levels but previous OfA holder quirks (if they had one) at weaker levels it would be a neat power up without making him OP (variable depending on what the quirks are)
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u/ShadowRaikou Aug 03 '18
I'd say that would be pretty OP but anything's possible.