I don't know what you mean- as far as I know your head is a lot harder than most helmets so impact required to break the two is not equal and thus a broken helmet does not equate to a broken head. Your story is purely antidotal and means very little to the helmet discussion. I am sorry you had a bad spill but it doesn’t prove anything one way or another.

That being said, I took a spill last weekend and broke a helmet. Bike came out from under me on a muddy corner- not much of an impact, small bruises on my hip and upper arm, hand still hurts (I was in the drops on the brakes) and a broke helmet right where the arm for a mirror attached. I believe I would have maybe hit my head without two inches of helmet and mirror attached to it and I probably would have had a bump for a week. However, no way would I have really injured my head on that fall without a helmet. Either way my story, like yours, is not a proof of anything other than antidotal evidence is worthless.