I previous mentioned 'The Dark Triad' but it seemed to go unremarked.
Narcissism, Machiavellianism, and Psychopathy
Where in the triangle a person may be will be unique to that case.
I mentioned it because DECADES before any legal charges were framed, they were NOT hidden traits.
I hope I was fair, I noted that heritability and upbringing both play there part so RB was dealt a bad hand. However, fame was likely what 'fixed' those traits as the associated behaviors were allowed, overlooked, forgiven, excused. But point to ONE example where rather than admit fault, it was ALWAYS something else. The alcohol, the drug addictions, the sex addiction - never HIM.
I've only ever seen the inside of a British prison from the perspective of a vistor and what those I visited told me. But taking away ALL power, ALL individuality and ALL freedoms will be far harsher on someone inside the dark triad, If only because failing to engage with forensic psychiatrists to whom patients within the dark triad are not particulaly rare could potentially see him serving the entire ten and a half years.
Failing to engage or worse, pretence of engagement would prejudice any parole board (who WILL read a pychiatric report) and in theory even after ten and a half years parole could STILL be refused.
Psycopathy is the most refractive attibute to treat but it IS possible but IS dependent on a wish to change.
If you know anyone who has served a long term in prison - ask THEM. The system is honed to deal with whatever choices the convict makes. Want to attack the screws, fine, you end up on the seg and get a decade added to the sentence. It isn't really optimized to treat personaliy disorders but is the final sanction - that person is removed from society.