You would disagree with him? Since you would disagree with him on such a fundamental issue (evolution) then would you not consider him to be a non-credible witness for the ID movement?
I don't know enough about the specifics Intelligent Design to know wether common descent is incompatible with it, but even if I did have an opinion, what difference would it make. I'm not an advocate for Behe or the ID movement, and you certainly seem to think that his reputation is pretty much worthless.
You might want to pick your battles with a little more thought since all you're doing is treading water here.