I think way to many people assume if you train hard, that automatically results in success. It doesn't. One of the biggest obstacles to success in major competitions is handling pressure. I think Mirai had trouble handling pressure at the 2012 Nationals, but she is by no means the only one. In the Boston Nationals, pressure certainly got to Gao, Agnes, and to a lesser extent Wagner. I don't believe for a minute these three skaters went to Boston undertrained, I believe the pressure got to them. Nagasu, on the other hand, went to Boston without a primary coach, skated very well and didn't let the pressure affect her performance.