"As I understand he stated that having looked at a large number of patterns & considering the number of perfect scores posted some number of targets "Must" have been broken by a single pellet."
Which only seems to indicate he's fulla crap.
My target guns for either trap or skeet print 70% or better at the appropriate distance, either 40 yards or 21 yards as the case may be.
I've shot 100's at both games.
I can assure you, without a doubt, that during those events I got no 'one pellet breaks' with a correctly pointed target.
None. Zero. Zilch. Nada.
You don't chip and chunk your way to a 100. You center targets on the way to 100. If you are hitting your stride and you miss or chip, you know why.
I'm confident in stating that with modern loads and guns a 100% score is a statistical certainty. The 'chance' element was eliminated by the plastic shot wrapper and hard shot.
I'm not saying there are no one pellets breaks. We've all had more than we admit. It's just that a prefect score is not dependent on it. If it were, the 'random distribution' would be found at the top of the leader board. Shockingly, it isn't.