About rigging of pong pong balls, it can be done--was done years ago in the PA lottery.
But you wonder if the owners would allow it.
I trust Silver more than Stern. Stern is suspected of rigging the lottery so the Knicks could get Ewing. Something about wrinkled envelope in the draw. Then Orlando won it two years in a row, picking Shaq and Penny. Orlando was Stern's pet franchise, he picked especially for TV market growth in Florida. Then the Cavs come out of nowhere to win it when James signed with them.
That the Celts won it this year suggests Silver is a straight shooter. Hi Yo Silver!