A consensus would appear to be that he is staging this admission of guilt for his own narcissistic aims. That he is trying to control his own fate perhaps?
There does seem to me a disparity at times between his body language and his spoken responses where they seem to be rather in-congruent to real remorse.
How much is he protecting the bigwigs?? Thom Weisel? Amgen? Federal government? The pharmaceutical industry?
Fall guy! Who got too big, sold his soul to the devil (Thom Weisel and Amgen for drug testing) and his tendency towards narcissism taking him to believe that he was bigger and greater than all of them and believed his own hype!
Just a theory!