One of the most interesting phenomenons is how an authority site can be #1 for red topic, blue topic, green topic and purple topic, but be 950 for orange topic, even though the linking, page structure and keyword usage is basically the same for all of them.
Precisely the situation I'm seeing. Very strange.
And poof, gone the next day.
Have you seen the same site repeat the top rank=>950=>top rank cycle more than once?