diberry - 5:27 pm on Aug 31, 2012 (gmt 0)

What I do take issue with them on though is the damage to SERP rankings of "innocent" sites inherent in the mysterious "shuffle" used to befuddle and identify those who zig zag in response to Google's moves

I hadn't even thought of that. In order for a zigzag site to go UP, other sites must go down. There's less and less connection all the time between how you run your site and how Google ranks it.