I really like the fan theory that Yaz never told anyone details of her running to get the antidote for Sammy in season 3 and just the camp fam not asking because that was a really eventful night and really they didn't need to know how Yaz did it, they were just happy they were all live.
But also, really adds a layer of debt to her worrying about Kenji being self-destructive because she got very self-destructive, nearly killing herself, over getting Sammy the antidote. Kenji very much reminded Yaz in Chaos Theory of her 15-year-old self having a mental breakdown in a lab, unable to find the cure, and then shouting at a dinosaur to hurry up and eat her because she'd rather die than not reach Sammy in time.
But she had Sammy, he didn't have anyone, and she read him the best out of the group because she knows what she would have done had Sammy not made it on that island.
