If this episode had a tagline, it would be "I'll let you draw your own conclusions about what's happening inside." The mystery deepens, which is a polite way of saying nobody gets a straight answer. The episode leans on reruns of earlier moments, which is nostalgic the first time and less so the fourth. Long-time viewers get a payoff: "Why was I brought into this world?" is no longer a mystery. Good enough that your phone stays in your pocket. Mostly.