His mother Georgine Smith has raised concerned that her son had earlier asked to be segregated from another prisoner who had been convicted of sexual offences against him.
Counsel for the family, Kerry Cook, also raised questions as to why Twidle had been transferred from a specialist treatment unit at another prison back to Christchurch Men's Prison before his death.
A police investigation into Twidle's death found that he'd worked in the prison laundry, where he was considered a good worker, on the morning of December 6, 2013.
However, when a prison worker came to his cell to get him to work he'd appeared "slightly distracted" and was twice asked to get moving.
Twidle returned to his cell at about 11.10am and was alone until his cellmate was escorted back at 2.02pm.
That was when prison staff found Twidle dead in his cell.
Staff were praised by prison inspector Trevor Longmuir, who compiled a report into his death, for their prompt response and for carrying out CPR for 25 minutes until St John paramedics arrived.
The police officer who investigated the death, who has name suppression, was asked by Mr Cook whether he looked at how contraband found its way into Twidle's cell. He said he didn't, and neither did he ask the cellmate as to their origins.
Investigators were told that a man convicted of assaulting Twidle was able to shout out at him from one exercise yard to another: "Bradley Twidle, you'll get what's coming to you."
Mr Cook also asked the investigating police officer if he investigated how a prisoner who had a non-association order banning contact with Twidle managed to threaten him.
The officer said the format of the wings has changed since then and stressed that the offender banned from Twidle only exercised in the neighbouring yard "for a couple of days".
Mr Longmuir recommended that Corrections consider a review of one particular safety issue, of which the specifics cannot be reported.
But Mr Longmuir confirmed to Coroner Devonport that no changes had yet been made.
Under cross-examination by Mr Cook, Mr Longmuir admitted he had "no idea" how Twidle got contraband into his cell.
Mr Longmuir also accepted that it was "not ideal" that Twidle came into contact with a prisoner who was supposed to be kept away from him.
He said, however, it was "almost impossible" to stop prisoners shouting at each across across yards.
The inquest continues.
