Delta does not factor time of check-in for upgrade priority. Delta pretty much always holds back FC seats for last minute sale, so the fact that 2 seats are empty does not mean all Delta Elites have already been upgraded. I suspect you will see a number of Delta elites on the upgrade list for the flight. As they check-in for the flight, they will bump you down the upgrade list (the upgrade list only shows those of have checked in for the flight).
Thanks, everybody! I OLCI'd last night, and indeed: "#12 of 12"
I am at a Chone Figgins-like rate for DL UG's: 1 for my career (since they started UG'ing us at all, of course).