Feel like Trout is a perfect example of the mental aspects of the sport. Some fighters, like Marvin Hagler, Ali, Bhop...etc., can take a controversial loss and use it as fuel to improve and fight harder in their next fight. Other guys, like Trout, can lose a couple of close, disputes fights and lose something. Kelly Pavilik was the same after his close loss to Sergio Martinez. Some guys just lose some self confidence and never recover. Trout is a very capable fighter and as you pointed out, isn’t that old, so that leads me to believe it is a mental thing with him.