Bruno Heller said that RED JOHN is in the list of the seven suspects. So the identity of Bob kirkland may be associated with himself or his twin Michael.


"HE IS M. ..." probably wanted to say "HE IS MICHAEL KIRKLAND"


In the image of the seven suspects, "Bob/Michael" Kirkland is the only one to have a particular color in red (the tie).
Look at the picture: http://oi39.tinypic.com/2gy36t0.jpg

Red John is "Michael/Bob" Kirkland.