From what I have been told the posssible hair line spider webs in the gel coat are what you should be worried about. The internal foam is going to do its job even if it is cracked. They say that if the gel coat is at all compromised that the helmet is much more likely to fail under crash conditions. That is why they say to trash it if it falls from handlebar height. A short fall isn't going to do anything intgernally but it will affect the gel coat.
Motorusher formally known as DirtySanchez919.