There are a total of 3 pilots in my SILO each of us good for 2 days starting tomorrow. Two pilots(myself included) have had 1 SC each and the other Pilot has Zero. I got the SC assignment. It was my understanding that SC will be assigned to pilots in the silo with the least amount of un-used short-calls. But in fact, the other pilot with ZERO SC got skipped over to assign it to me.