Earlier quoted context omitted.
Look at his publications: http://wuphys.wustl.edu/~katz/publist.html He does not seem to have particular expertise on this problem.
He entered the project based on aptitude and left based on politics. That's why it's unsettling.
http://tpmmuckraker.talkingpointsmemo.com/2010/05/mission_im...
Note that Katz is called the "What am I doing here" person. And note, the above summary piece was posted in advance of those writings coming out.
I think the real issue is, why did Chu ask Katz to join the team in the first place? He's really not got the same track record as the others on the team. Not even close.