Thanks to BBQuest for making me aware of this! Just having a listen now and it's quite interesting actually. Only 15 mins in and probably will be one of those things I gradually listen to in small doses over a few days.
He said that the producers did a guinea pig run/dry run with a completely different set of cast members (including a different set of twins) before the actual islanders for the real series moved in. Jess was only supposed to be in the guinea pig run but the producers found her so entertaining and interesting that they pulled her out of it a few days into the run and put her into lockdown as they wanted to make her an official islander instead. She ended up replacing Naomi in the original starting line-up, who had already been put into lockdown, so Naomi was in lockdown for weeks and weeks
