Intelligent design is not perfect design and Dr. Behe believes in common descent – so what is the problem again?
What is the use of designing something that doesn’t work all that well? Intelligent design is not a falsifiable argument as I can’t disprove that the designer doesn’t exist and Dr. Behe cannot prove that he does. He can bring up instances which he feels (cannot prove however) shows a designer. By the same token, I can demonstrate evolution but cannot prove or disprove a supernatural designer.