After yesterday, my theory is that Kavin and Sandy was hired as contestants by vijay tv for this season... Their purpose was to make sure Tharshan, Mugen and Los reach top 5 to the max... They must have know all the contestants who would participate before hand and made a rough plan.... Also these two nominated the same ppl and two votes equal nomination.... and their deal is that they will make to top 5 and maybe some other opportunity as well....therefore both propaganda always was the 3 deserve it more than anyone...Kavin took the girls concept... Sandy keeping everyone entertained...Some things happened unexpectedly.... One of them was Saravanan elimination, who both used to isolate themself from the others and to not develop any serious bond with the others....this lead to both bonding with Mugen and Tharshan...and Sandy liking them....another one Sakshi route... They did not expect her to take the flirting seriously and divert the flow of the 4 girls story, which lead to the end result of Los and Kavin main story. Sandy liking Mugen and Tharshan...Kavin some feelings for Los created some misunderstandings between both which can't be discussed openly.
I think this is why BB had no punishment when nomination was discussed or stupid reasons were given for nomination... All evicted contestant said that Kavin and Sandy discuss who to nominate each week. When Kavin was in nomination until Sakshi elimination he may have been saved somehow through his fan base only but when the negativity increased Vijay TV may have hired paid army... All this time I did not think Vijay TV will go that far for a contestant but they will if the contestant was hired for a purpose.
All this is my theory only but fits with wha happened this season and some things that Kavin and Sandy said yesterday.