Something just dawned on me (just being slow??).

If I have an itinerary AAA-BBB-CCC and are waitlisted for BBB-CCC, then when doing OLCI at 24 hours prior to AAA departure, the DM time for BBB-CCC is before OLCI is available for BBB-CCC. Putting me ahead (at least for the DM time) of those doing just BBB-CCC.

Can you go on the DM list more than 24 hours before scheduled flight time if you have an earlier flight?

Realize this is not a huge deal (status and fare class are more important) but in this case BBB is a hub with lots of potential upgrades, this is small edge might be useful