I would be dubious about anything in the Sun, however I have read that there was some queries about whether PS was actually 'really' mad - there was no indication prior to his offences that he was suffering from paranoid schizophrenia and even his wife had stated that he was 'a normal bloke at home' - its quite hard to be a 'normal bloke' if you have a mental illness that causes you to want to rape and murder so many women. There would have been some significant indication of this prior to his offences.
I have for a long time thought that PS was placed in Broadmoor more for his own safety - I have never believed that he was truly mentally unwell and this now makes me believe this even more so. JS obviously knew someone high up somewhere to be able to go about his 'charity' perversions in our NHS Hospitals- wildly speculating but who is to say that he didn't have a hand in ensuring PS got out of Prison and into a hospital for 'treatment'???
Speculation of course.......