[moultonmg]

I believe that most of what everyone is saying is going against the rule. Under the definition of possession it says

"A Ball shall be considered in possession if, as the robot moves or changes oreintation ( e.g. backs up or spins in place), the ball remains in approximately the same position relative to the robot."

If you use suction then when you back up or spin the ball would come with you, which is the same position relative to the robot. Therefore I think the suction idea is out altogether. Unless you plan on sucking it up and then never moving.