Boy, do I love indie horror, but not the ones I make I feel like every game moves to Logical to Mystical My guess of why he had a Boarding pass - He wanted to get away from the Kindergarten because of everything that happened, and he didn't want anything to do with the speculations, but they stopped him because the only mascot they didn't invent at the time was Banban, or to make sure nothing else happened, he stayed and turned himself into the monster in the know today.
credit to Thinknoodles and TheGameSalmon for the images, btw