I am saying, the max shearing stress of the Marker Jester Toe piece, at colder temperatures, is pretty close to the max release value. So...... With moderate use at those values, your are BOUND to break them. But, if you are a lighter person who has incorrectly set forward pressure, you will likely need to crank up the din higher than it should be, to get the same results.
Point being, You can't take a narrow ass piece of plastic, ans subject it to din pressures above like 10, without expecting failure pretty frequently.
So yes, I am saying, if he is coming out of the binding when he "should" and staying in when he "should" and his din is set at 14, he should probably be breaking the binding.
And, unless he has like size 6 feet (doubtful), he should NOT have his din at 14, even at his height and weight.