yeah, I don't know what to tell you, it was an adcom member who interviewed me and went over the process. I would think the same as you that 2 people would read the app before an interview, but she did mention that the reason for the 2nd read was to have as many eyes on the application as possible (2 readers, an interviewer and the director), so they could just go in a different order than other schools. She didn't get into any detail about "committee meetings" to discuss the candidates, so that could possibly happen as well (she was trying to breifly tell me about the process, so it makes sense that she didn't go into too much detail of 'what happens when readers disagree' or 'how many people read it before they deny without interview'- I'm sure they have a fair way of reviewing every application). I wouldn't worry too much about it, every school has a system that works for them, and it seems like a lot of people have a say in your app, so there is no one person that can make or break your app. I personally think it is great that the director of admissions reads every file personally, because they will have a good sense of the overall class.
In my intervirew packet, it included information that stated we would find out Feb. 1st and my interviewer said that date a couple of times, so I don't imagine we would find out early (none of the students indicated that they heard early either).
Overall, I was really impressed with the school and the students and how organized the day was. There were students there getting ready for interviews with companies and they still took the time to talk to candidates (if I was about to interview with Pepsi, I might not socialize with a prospective student!). The woman I met with was very nice, as was every person in the office I spoke to. Hopefully we will all hear good news on Feb. 1st!