tedster - 11:53 pm on Jun 19, 2012 (gmt 0)
I don't know that the keyword list was ever a straight "keyword density" thing - I've seen a lot of strangeness in those lists. However, you may have found some kind of clue or "tell" about Penguin here. I find it hard to think that WMT (which is not a direct part of the ranking infrastructure) would hold such a clue, but your observation is quite suggestive.
Has anyone else noticed something like this?