Based on my experience with TOPS, a great majority of those that make the teams are in higher levels. Most 10 year olds that make it are in at least L8 or training L8. Also those that made the team got at least high 8s on most skills and had near perfect scores on the physical tests. But most importantly, making the team is based largely on the pool of gymnasts competing. So a gymnast who may score well one year but is competing against a pool of many real talented gymnasts may not make it. And yet another year where a gymnast may score not as well may make it.
In the past few years, they picked the top 50 (if I recall correctly) and those made it to the A Team and the next 50-70 made it to the B team. Most kids who make it to the A team attend the camp because it is fully paid by USAG. But not all those that make it to B attend the camp because they are fully responsible for the cost of camp. So, when USAG gets a decline, they just go,down the list until they have fulfilled the number of gymnasts they need to cover the cost of,the camp. Last year, we were told during the parent's meeting that they need 70 gymnasts for the B team to offset all the costs of that camp.