Ding Analysis - Updated - Please help

Generally speaking, most interviews are not make or break, so they will interview a big group with hopes of selecting 1/3 or 1/2 of those that they interview. An offer to interview is a great sign, but it is not an indication that you are otherwise qualified for that year's class (I learned this first-hand with Columbia). For most schools, everyone that receives an interview is not necessarily on equal footing (hence not make or break). As necromonger pointed out, they will still review your entire package after interviewing you. A stellar interview can help your overall candidacy, but an interview will not necessarily strengthen weak parts of your application.

The GMAT is a big part of the admissions process. Just an off-the-cuff look at GMATclub results will show that people with scores below the mid-line tend to be admitted because of diversity characteristics. People from over-represented groups must be especially strong in the numbers phase of the application - especially when application volume is high (as it apparently is) and especially as it gets later in the season (as it surely is for this year).