There is only a small difference in bone mineral density between a fit and healthy 19 year old male and a fit and healthy 30 year old male. I doubt it would be enough to result in a broken jaw from the Gaff hit for Brayshaw at 19 vs no break for Brayshaw at 30.
In general I'm not sure if your questions about legal culpability etc. are serious. The comparison with getting hit with a cricket ball is misguided at best.
In general I'm not sure if your questions about legal culpability etc. are serious. The comparison with getting hit with a cricket ball is misguided at best.