Laminitis is a largely poorly understood disease. Things like diet but also foot conformation play a role and a healthy dose of mystery. It has been linked to diet, stress, weight placed on the foot (think barbaro), and a whole host of things. The thing is once they start on that path it can be very difficult to stop it. Some horses you can pull off the train tracks and manage, others will have one bout and are never pulled out. How old was this horse? It just seems that he was young, which makes me wonder if a genetic/conformation element played a role. It could just be pure bad luck.