Here is the answer per the FAQ on Varsity website
8) Are there skill caps for Standing Tumbling?
Yes! Once a team qualifies for the high range with most (75%) of the athletes, quantity will no longer drive the actual score. (i.e. a team that performs 75% standing back tucks may receive the same score as a team that performs 100% standing back tucks). Other aspects of the tumbling (difficulty, variety, etc) will drive the actual score.
9) How many athletes need to perform standing tumbling …really?
There are different scoring ranges for standing tumbling and part of those ranges is based on the number of the athletes that perform a tumbling pass (not a tumbling skill). Keep in mind, performing the specified number of passes listed gets you into a range, it does not guarantee a specific score. Also, for the highest range, teams must perform two passes, one of which includes synchronization. For L3-L5, the additional synchronized pass must be a level appropriate jump/tumbling pass
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