No, he did not. If you listen to his podcasts Marco's career is an open book. Basically, college -> unremarkable first job -> Tumblr employee nbr 2 -> Instapaper -> The Magazine.
While making money on doing podcasts and a blog on the side.
Yes but they are predicated on his successful career.
If he doesn't get founder status, then at the very least we have to give him "Tumblr Employee nbr 1" status.