During the final 4, then 3, they didnt seem to be allowed to discuss their thought process.
This made a massive difference, i feel, because Jaz didnt get the chance to explain to Mollie why he was voting for Harry. Andrew made it very obvious that Harry was a traitor by suddenly turning on him. Jaz knew this, but Mollie just couldn't work it out.
Also the fact that Jaz would not have chosen to end the game if he and Harry were traitors because surely if he was a traitor, he would have know that Mollie would have backed Harry over him. If Jaz was the only traitor, then he would have chosen to end the game, as Harry did.
Mollie, very sweet girl, but not the sharpest tool, needed this explaining to her and that didnt happen because of the way the rules were set this year.
I think though after season one, where Kieran, out of spite, ousted Wilf to the faithful, i dont think BBC wanted to risk that again.