[GaryVoshol]

This is two places where you say the ball "tends to" come along with your robot. It either does or it doesn't. If it does, that's possession. If it only sometimes does because your mechanism isn't 100%, then when it does it is possession. If it doesn't, it's not possession.

If you have demonstrated the capability of possessing more than one ball, you will probably be looked at much closer in future matches when you are herding balls. If your mechanism possessed more than one ball before, it's likely to do it again. So if 2 balls get into your mechanism another time, you'd probably be in trouble, even if possession isn't demonstrated that time.

Best to reconsider your design now, rather than having to do it on Friday of competition. Remember, referees might not be there to note penalties on practice day.