I no longer work for IELLO.
1. The only way to play 5 player is with the Troubled Waters mode, correct?No, it's a recommended variant with 5 players, but you can also play normally. This will leave a lot of choices to the Captain and can make games a bit longer, but it's still fine.
2. When playing with Troubled Waters, the Captain has to select their one card at random, correct?Yes: one random card from each other player.
EDIT : Antoine is much quicker than me…