The flight appears as sold out inventory-wise, but the app is telling me 18 open with 13 of those being C+ and 0 F. It was a complementary medallion upgrade, so no compensation. Will I still show up as displaced F once the flight goes to gate control? The C+ cabin is grayed out on the seat map so I can’t even get out of 4A

In the event that someone no shows, wouldn’t the Gate Agent clear #1 on the list? Or would they see that I (and possibly two other people) are displaced? There are seats open in C+ according to the upgrade list, but they’re not selectable on the seat map so I can’t even get out of 4A (although if this flight gets upgauged back to an E175, I’d love to sit in 4A)