Hi +Rand Fishkin
thanks for the excellent post. As I read, it made me think of a question. What would happen if you had a number of links pointing to page A, and then you swapped those links out and replaced them with links pointing to page B? I wonder whether or not link echoes would still apply to page A in the scenario where links are totally swapped. I'm not sure if this is in the queue as an upcoming test, but I'd be interested to see how something like this would play out.