Emergency services were alerted after the two men fell and Silcox, 56, from Pontnewydd in Cwmbran died two hours later.
Thomas, 54, also from Cwmbran, flew back to the UK for treatment and was transferred to University Hospital Llandough in Cardiff, but died nearly 10 months later on 10 July.
Opening an inquest into shop manager Thomas’ death, Gwent coroner Rose Farmer said he fell between 15ft and 22ft (4.6m – 6.7m) after a wooden bannister collapsed.
He was taken to Doctor Jose Molina Orosa Hospital on the island for initial treatment before he was flown back to the UK at the end of November.
An earlier inquest opening into the death of Silcox heard he died from a traumatic brain injury, skull fractures and skull lacerations.
