The top rated answer to this question about the Alcubierre drive asserts, "spacetime can dynamically evolve in a way which apparently violates special relativity," but according to the Wikipedia article on the speed of gravity, changes in the gravitational field propagate at the speed of light. The second answer under this question puts the limitation in broader terms: "distortions of spacetime are as limited to travel to the speed of light as any other physical influence."
These statements appear to contradict one another. My question is:
Does the Alcubierre drive depend on space-time distortions propagating at superluminal speeds, and is that possible under general relativity? If Alcubierre drive distortions of space-time can propagate at superluminal speeds under GR then why can't gravitational waves (another traveling distortion of space-time) also propagate at superluminal speeds?