Part of operating a winning robot is being able to explain your robot to the technical judges. If your team cannot explain how and why the robot does what it does, you have missed the point of LEGO robotics. The actual robot performance is only a small part of a robotics competition; the most important component is what a team learns from the process. This is what the technical judges want to hear. They need to see and believe that the robot team actually did the work on the robot and learned something in the process.