Most competitions require video playback for whatever purposes judges need and they tend to use them for counting. As for tumbling, there are different scoring ranges for standing tumbling and part of those ranges is based on the participation percentage (majority/most etc.) that performs a tumbling pass. Keep in mind, performing the participation percentage of level appropriate passes listed gets you into a range, it does not guaruntee a specific score within the range. The highest range requires a synchronized pass by most of the team. So 75% of your athletes must perform the pass at once. So you could have one athlete doing standing tumbling passes through the routine and they will accumulate but you wont get in the highest range. For running tumbling, like standing, the ranges dictate the participation percentage (majority/most etc) of level appropriate passes required to be performed to get into any particular scoring range. The number of passes required for any given range depends on the number of athletes on your team. Synchronizing passes is not required for running tumbling, so yes one athlete could, in theory, run around throwing passes and still get you in the highest range. However, synchronized passes are more difficult and may affect your score within your range. As a coach you will need to decide if synchronizing passes make the most sense for your team. They have the potential to boost your difficulty score, however, if your synchronized passes are not timed well, you may end up with a lower score in technique and not get credit for the synchronization.