One of the missing people that this article does not mention is Simon Carstensen, a danish dude that was a co-founder of Infogami. I met Simon in an university class and I knew him for some time before I knew he was part of Y Combinator's first batch :-) Simon traveled back to Denmark after his round finished.
Yes this is called survivorship bias. Only the successful people end up being in these news articles, thus leading people to believe that everyone going through YC ends up successful.
It probably has more to do with the fact that Infogami's other founder has said since the beginning that he was a sole founder, and never once mentioned a co-founder.
