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Glenn writes that we need "...an external Commission of the type that investigated the 9/11 attacks -- endowed with full subpoena power...." He's mentioned this in different posts, if I remember correctly.
Anything like the 9/11 Commission is what we do not need! That commission was biased before it began and the report itself is a sham. Full subpoena power would be great, but what good would it do if they refuse to submit?
To paraphrase, LWM seems concerned that Glenn's investigation and questioning may blur the line between the "cult" of those seeking the truth about what happened on 9/11, and the "legitimate" people who wouldn't ever look deeper than the 9/11 Commission's report.
No, we only want to follow the clues and evidence up to a point. We wouldn't want to actually follow wherever they may lead.