I had him up at or before 8 on both knockdowns. The second count seemed quite slow but he was comfortably waiting and then up.
Don't forget Wilder was gassed already by the 4th and had been down so probably wasn't hitting at full power. But I agree he can't one punch finish Fury
Maybe Mora would have decided that a third KO was the end, some referees are prone do that. Otherwise, outside of arbitrary calls he can't influence, Fury gets up and carries on like the fighting machine he is. No guarantee that Wilder scores the third KD, though.