Tuthluver,
The last interviewer I had at UNC explained the whole process to me right at the end of our conversation. This is what he explained (atleast for the first round of acceptances):
-Right after the interview day is over, all 3 of the AdCom members that interviewed with you meet. Since all 3 of the members met with the same...lets say 5 people...they go ahead and rank you out of 10. This is worth 40% in their formula. I think DAT's are 30% and GPA is 30%. They then plug you into an excel spreadsheet with everyone else (in my case..people who interviewed in Sept, Oct, and Nov)....I guess this is somewhere in the 200 student range....give or take...the top 4 or 5 people he said basically are automatically accepted.
-Now, this is where your question comes into play. Each interviewer (again this was in Oct), gets to choose roughly 3-4 people that they want to see get accepted....they will then basically have a big discussion and fight for your admission....I am guessing after each person is introduced to the rest of the committee they have a vote on whether the person will be accepted, rejected, or waitlisted....
I do not know how it will work for this round of acceptances because I don't know whether they will re-plug in everyone from the Fall interviewers....along with this past weekend interviews...back into the spreadsheet to see who the top people are. They might though. But to answer your question, each interviewer (not sure about the student), gets basically 3 or 4 people to advocate for. You also have to remember that there are still people from the first round of interviews that your interviewer may want to bring back up again to the committee!