@Mr Stickyfingers and other virgins.
When they get down to a certain number, they merge tribes.
Then when they whittle that number down to whatever 10 or 12, each evicted person become part of a jury, and that jury votes for the winner
But what do the jury members base their decision on? Are they kept abreast of developments in the game or do they rely on friendships/alliances made before their departure?