Everyone was going around acting like this meant 50% of 2nd graders were stupid with terrible parents. (Or, conversely, that 50% of 2nd graders were geniuses for "knowing" it was potatoes at all)
But I think that was the wrong conclusion.
The right conclusion was that all the kids guessed and they had a 50% chance of getting it right.
And I think there is probably an element of this going on with the small models vs big models dichotomy.