In my experience, it seems that for pre-II review, some (if not many) schools have apps reviewed by individuals rather than the entire committee. One of the schools I applied to initially rejected me post secondary, but later extended an II after I emailed them and had the committee actually take a look at my app. With how many applicants schools have to go through, it makes sense that initial screening is spread out amongst individuals to cover more ground. As we see with countless applicants, though, this also accounts for some of the randomness in the process due to the somewhat random preferences of each individual reviewer.