It is to your credit that you noticed that Cashill does not deliver.
The notion that Cashill has established common authorship is truly absurd, and all the speculations piled upon that flimsy premise are more of a symptom than an argument.
I agree that it’s purely speculation to this point. Cashill aside, the question is an interesting one. Sans teleprompter, Obama gives very little evidence of the complexity of thought that informs his books. One one occasion, when asked about the recommendations for Social Security reform described in “Audacity,” Obama seemed quite unfamiliar with what he had ostensibly written.
And, of course, the use of a skilled ghost to supplement a political talent’s resume isn’t a new concept.