Remember that Kirkland had Jane kidnapped in a cabin, that cabin (property of Michael Kirkland) was said to be surrounded by pine trees (the earth is implied). Bob was manipulating a hammer and he didn't even use it (one can relate hammers to nails). And remember that Rosalind said that Red John smelled like pine, nails and earth. I don't think this is a casuality. I didn't think too much about Michael at first, and my suspect was Haffner, but now I don't know.
