I may be giving them way to much credit here, but I took that interaction as as indication that Dr. Pepper just didn't know about that particular aspect of that guys preferences. I imagine they have 3 "experts" because no one person can know everything about all these people.
I would imagine that the questionnaires are used mainly to weed people out, and/or to produce personality profiles that they can reference when matching people. Maybe it gives them more a Myers Briggs style profile and they get most of the specifics about people from the interviews and going through their refrigerators..?
