Who knows if Bob's balls were polished like a marble or dirty from days of play? Throw some balls in a Diamond polisher with some ball cleaner and buff them like a mirror and that video could have been 10x longer.
dirty from days of play is fine.
show a video with you simply wiping the inside of the pocket and the ball with a cloth (polish not necessary...just making sure it's not chalked up)....then put it on table...shoot until you make it without a cut in the tape or anything going out of view....then when made...pull the ball out of the pocket...click it against the cue ball and show that both are normal balls. i'd call that minimal evidence. a trusted witness would add to it.
i'll bet.