Its simple, easy and fast to spectate any game since not everyone made the crash into the deep abyss RIP pilot Jones is now selectable from the character selection screen when a game has started
Passengers that didnt make it out alive will be spirits that can roam the island, spirits cannot interact with anything or anyone but can talk you through your survival.
Since not everyone can play at the same time, id atleast like you to join and see some of the amazing stuff the game has to offer.