Question: who came up with the backdoor plan on big brother

title: Big Brother 5 (U.S.)
text: The season 's main theme was titled `` Project Do Not Assume '' , or `` Project DNA '' for short , and was incorporated through two twists . The first of these twists were that HouseGuests Michael `` Cowboy '' Ellis and Jennifer `` Nakomis '' Dedmon were , unbeknownst to them , half - siblings . The two share the same father , whom Ellis had never met . Ellis quickly figured out the twist , and Big Brother later gave the two letters from home explaining the situation . This twist had no impact on the format of the game , other than the personal implications that arise with the situation . The second twist was that a set of twins were switching spots in the house , with the goal of making it to the fifth week . If they succeeded this without getting caught , they would both be eligible to play as individuals . The twins , Adria and Natalie , both played as Adria , and would switch places at various times in the Diary Room . The sisters succeeded in the task , and Natalie entered the game on Day 35 . This twist was later implemented in Big Brother 17 . This was also the first season to feature a Fast Forward Week , in which two HouseGuests were evicted in the span of one week .