my take on this is that for most schools there still a month until the deadline. I know a lot of people that didn't submit until the week before the deadline. Probably not the smartest idea, but people still do it and still have success with it. In my opinion, if you are good enough for an interview/acceptance, it doesn't matter when you submit supplemental apps. dude I know submitted primary on last day possible (oct 15th) and all secondaries last day possible. Only school in top 10 he didn't get into? HMS. He had almost no EC's and strong statistics. So pretty average app (I put equal weight on EC's as stats). Not everyone is going to get this kind of deal obviously, but he was good enough, and it didn't matter when he applied, just that he did. Deadlines mean something. Apply before the deadline and you will be fine. If you didn't get an interview, it wasn't meant to be. Think of it like that and you'll have some mental peace.