This is just my opinion from my experience with SGU. The January term tends to receive less applications than the August term. If you think of a "traditional" pre-med student (e.g., getting ready to graduate from college or earn a Bachelor's degree), they most likely cannot start in January. Only an anecdote: I know of students that weren't accepted for August but were accepted for January. Granted, a few of them had to enroll in the Academic Enrichment Program (AEP), which actually isn't a bad deal.
Is there more to this story? I'm actually surprised with those stats that you received a flat-out rejection and not an offer for AEP or something similar. Your GPA is pretty darn good. Did you get an interview?