For states that are very competitive like MD it is not unusual that you only get one nom to one SA, they are spreading the wealth. This is why it is really important to rank them the way you truly desire.
Also, realize that if the MOC has their last interviews in January you will not hear until they complete all of the interviews.
January is not late since the slate is not due until Jan. 31 (typically). I know for our DS Burr did not do his interviews until Jan. The nom notification came within a few days from the interview.
If you receive alternate that does not mean it is all over if the principal accepts, you can still be put into the "pool" with the appt coming from different sources. You need the nom to be put into the pool. Additionally, there are principals who select a different SA, which frees up that appt. Like 11 stated a lot can play into the situation. My anecdotal story is a candidate got prin to USNA, but wanted USAF, our friends son got prin to USAFA and wanted USNA, they called the MOC and they switched it, both are now at their dream SA.