He Hated The Cameras
As if living in a house with seven other kids wasn’t chaotic enough, it didn’t help that Collin didn’t like being filmed. At one point, he had become so overwhelmed by the filming that he even refused to have his picture taken for the school yearbook.
Although the film crews tried to make life on the kids as stress-free as possible, there’s only so much they could do while still getting their job done. It’s assumed that constantly being filmed throughout his childhood was a contributing factor to his disappearance on the show.