10 years ago they had 9 First Officers on the Classic. They were all assessed for command. Then they hired FO's for the Classic and MD11, so in the last 10 years there was no one with the seniority to get offered an upgrade.
Anyone who joins today will need 1000 others to upgrade before them and remember that the system is biased, it will accept a few expat upgrades at a time, but it wont accept a full class, so seniority numbers will be jumped.