I thought Jordan Chiles was part of the regular team, but in all the articles she’d being identified as the alternate?? I guess I don’t understand how all this works
There are 4 members on the team, but in the finals only 3 compete in each of the four events. It can be a different 3 on each event.
In this case, Jordan Chiles was not slated to compete on the uneven bars or balance beam. But when Biles dropped out, Chiles replaced her in those two events at the last minute.
At least that is my understanding.