Good points @Mirrorpillar
Although even without Harry, I think Mollie was staying until the end. One of the players (can’t remember who) said that Mollie would never be banished. And they didn’t think she was a traitor. Her name was not written down at all throughout the game.
Harry’s name wasn’t written down at all until the end with Andrew doing it for the first time.
Harry said in the interview @noblegiraffe linked to that he made friends from the beginning and kept working on it. He said that Jaz was brilliant but that Jaz’s issues had been that Jaz never trusted anyone, so no one trusted Jaz.
I’d amend that to say Jaz didn’t have to actually trust anyone, he just had to make out like he did.
It’s a social game, you have to make alliances.