Which of the following conditions must be met during the intersecting/passing-through move element?

The requirement that all skaters must be in their formation position before and during the intersecting/passing-through move element is crucial for maintaining the integrity and synchronization of the team during this maneuver. This ensures that the skaters can execute the move in a coordinated manner, which is a fundamental aspect of synchro skating. Consistency in each skater's position allows for the creation of visually appealing formations and prevents collisions, facilitating a seamless transition during the maneuver.

Staying in formation positions enables the skaters to maintain their lines and spacing, which are critical for achieving the desired look and flow of the routine. This adherence to formation positions is essential in showcasing the unity and precision of the team, which judges look for when scoring synchro performances.

In contrast, the other conditions would disrupt the cohesion of the formation, making it challenging for the skaters to perform the element effectively. Changing positions randomly, for instance, would compromise the synchronization and could lead to inconsistent execution, while limiting the performance to one skater at a time would undermine the essence of synchronicity that characterizes this discipline. Moreover, allowing formations of three or more could introduce unnecessary complexity that detracts from the overall presentation during this specific move.