"Injury prone" is meaningless. Nobody is injury prone. The migraine thing is concerning, because that can be chronic. Crede's bad back was chronic, for example, and those kinds of things can derail a career. But injuries are injuries. They happen and then they heal, or they don't. You're not more likely to break your toe again, because you fouled a ball off it and broke it once. The thing that is concerning about Buxton is his ability to hit MLB pitching. THAT's concerning.