Is there any plausible theories on what happened?
There is a school of thought that says Stuart was never actually in the pool at all, that he was murdered in or near the jacuzzi and that his body was placed at the poolside and water poured over him to make it look as if he had been recently dragged from the pool.
There isn't even a clear narrative over who it was that actually found Stuart's body and who pulled him from the pool. Barrymore says it was he who first saw Stuart and raised the alarm; Jonathan Kenney, Barrymore's boyfriend at the time, claimed that he and Kylie Merritt pulled Stuart from the pool and started giving CPR while Kylie's brother, Justin, called the ambulance but then later, in a newspaper interview, Kenney changed his story and said that by the time he ran out to the pool, Stuart's body was already laid out on the side.
Presumably his story changed because the two men who left with Barrymore before the paramedics arrived had told police that THEY were the ones who first discovered Stuart in the pool and that they were also the ones who pulled his body out (before immediately running off without stopping to see if the man they pulled from the water lived or died).
Whilst I can believe people were so drunk/high that some recollections may be hazy, I cannot imagine something as momentous as discovering a body and/or pulling them out of a pool would be easy to confuse, yet the different versions of events all contradict each other.
I honestly believe Stuart was attacked by more than one person and that he suffered a heart attack as a result of his injuries and/or asphyxiation and when the perpetrators realised that he was dead they panicked and a plan was concocted to stage a drowning.
Although it is always said that Stuart's body was discovered in the pool, he was at the side of the pool when the paramedics arrived and we only have the word of those 8 people who attended that party that he was ever in there.
I think Essex police just went along with that assumption, accepting that it was accidental until the subsequent discovery of the anal injuries.
By that point the crime scene hadn't been properly secured, Barrymore's agent had been allowed in to tidy up (he even tested the pool temperature for the police!) and Barrymore and Kenney had been whisked away to rehab, ostensibly to protect them from press intrusion.
It was a horrible cover-up of an evil crime, aided and abetted by police incompetence and Barrymore just wanted the inquest to record an accidental drowning verdict so he could move on with his life and career. He and his friends in the media to this day try to spin it that the official cause of death was drowning and also that Barrymore was cleared of any wrongdoing. Neither of these facts are true.
I now understand that the 50 year old man arrested on suspicion of murder has been bailed until 12th April, pending further enquiries. I sincerely hope that charges will result and that, finally, the truth comes out so that poor Terry Lubbock who is terminally ill, may at long last get to see some sort of justice for his son before he dies.