No worries, only 4 compete with all 4 counting, so yes, if a fall occurs, the fall counts. They are allowed to select alternates which can be called on in the event of injury (Ragan Smith was an alternate for the 2016 Olympics) but only those 4 scores will be added to the team totals. The individual gymnasts while representing the US as an individual will do their own thing. I am also not a complete expert on the Olympic format so I could stand corrected, but at the Olympics they have 2 separate competition days. One for individual and one for team competition. That is why someone like Simone Biles can potentially win 6 golds, 4 for the individual events and 1 for individual all-around at the individual portion of the competition and 1 for the team competition. Idk why they really screwed with the rules this year. Apparently there has been enough uproar that they are going back to old rules for 2024.