For future reference, we usually treat a 7.5x difference in AP to be a one shot or the ability to face tank with ease, of course it can vary from verse to depending on context, but as a standard rule of thumb, 7.5 is usually where it becomes a bit stompish if the weaker lad doesn't have anything to mitigate that, like power boosts, hax, or abilities that can net a win outside of pure AP.
Kinda being generous to Dio here as is, given the 8-B durability is a huge issue he'd have trouble getting past.