@Jayar
I second
@skatfan Balance Beam Situation is the best.
The US has qualified a 4 person team, plus an individual spot (gymnast #5) that can be awarded to any US gymnast. This was was a spot that should have been determined by the results of the World Cup AA series which was cancelled. There were 3 spots up for grabs there that, after the cancellation, went to USA, RUS and CHN.
Jade Carey, of the US, earned what is currently the Americans' 6th spot, but it is for her alone. If she elects not to use it because she wants to try to be on the team and earn a team medal, no other American can use this spot.
At this time, no one knows when Jade has to confirm that she is taking that 6th spot. Will it be before US Gymnastics Trials or after?
Gymnast #5 and Jade Carey, should she elect to use the 6th spot, can both compete all four events in prelims at the Games, but can't compete in team finals.
However, if a gymnast on the four person team gets injured between athletes arriving in Tokyo and the start of the preliminary round, either Gymnast #5 or Jade Carey, if she is using the 6th spot, can serve as alternates and replace the injured team member.