The lighter spots? It might just be the resolution, but those don't look like craters to me. It's likely that they're damage from strikes, but we don't know age (a Jovian moon should be getting far more frequent strikes than the moon), and they look like the ice healed over them. Compare to this image of the moon:
Look at the edges - you can clearly see that they're craters there. I don't see that in the Ganymede pic.
I'm not really sure why I'm talking about this though; you're probably right and there isn't much shifting. I only see a handful of the fracture lines that usually indicate movement like that.
edit: I'm taking it back! This is Ganymede: