I don't understand: DJ Patil joined Color five months ago (according to his LinkedIn profile), yet Color is more than one year old. Why is he called a co-found

I don't understand: DJ Patil joined Color five months ago (according to his LinkedIn profile), yet Color is more than one year old. Why is he called a co-founder? He doesn't even say so on his LinkedIn profile (a lot of people claim to be a Color co-founder, though).