Steddings and dark channelers

the only possible explanation is that just before the breaking started, all the ogier were out of their stedding fighting for the light (presumably they haven't fought for the shadow).

 

this is the only explanation that they get lost from the steddings.  since steddings themselves shouldn't be movable even if their surroundings are being turned upside down.

 

btw, is the stedding bound to the land it is on, or is it bound to the co-ordinate location?

I'm afraid that is not true. We know for a fact that the Ogier held to the stedding as long as they could, well into the breaking--during which they sheltered the male Aes Sedai who later created the Ways. But finally the upheval drove them from the Stedding (at least in the Westlands, in Seanchan things may have been different), and after which they lost the stedding.

As for your question, we do not know. Either could work--even were it bound to co-ordinate, finding that would require landmarks and the Ogier would still be lost.