How important are challenge wins in this game?
It's not on the top of the list of things for people to do in order to win. There are multiple ways to be successful in Survivor, and people who are usually excel in all three of the social, physical, and strategic facets of the game.
This is your very first tribal council as a merged tribe, are you nervous and how are you expecting the vote to go down tonight?
Anything can happen at any tribal council. If you're not nervous, something is off about that. lol
How important are tribal lines?
They help. We did have a tribe swap, though, so you can never know if those lines got muddled or not.