Wasn't that a demonic dragon? Not all dragons are equal. Medea is still mediocre in direct combat even if she could use her dragons. This also makes one wounder how NVRSQ could have obtained one if it were a half-decent one, unless that continent bragging wasn't hyperbole. What we do know is that Sakura's has the potential to continuously do the equivalent of spamming NPs. In fact, with the context of her having the output of 1000 units of magical energy, and the Camelot statement that the typical high-level NPs are
1000-3000 magical energy, Sakura effectively has the equivalent of A-rank NPs without a single pause. Someone like Salter might be stronger, but that's almost certainly in the context that she can do the same, but with Excalibur. I'm not sure NVRSQ's beasts are really on par with that output.
The one problem is that NVRSQ is pretty unquantifiable. How many magic beasts does he have? What's their durability, and therefore, his? Now, to his credit, didn't Arc say she couldn't beat him at her "full power"(30% in context)?