I had Crawford breaking through last year in 2013 when he scored easy wins over Prescott, Sanabria and Klimov. All high level opponents. That to me is when Crawford "broke through" and proved he was world caliber level then. His impressive 2014 performance vs Burns did not shock me in the least.
So I will go with Antonio Orozco (21-0, 15 KO's). Many posters here are aware of Orozco, however I feel his 2014 dominant wins over sturdy veterans Huerta, Honorio and Steve Forbes put this kid at a break through position to be where Crawford is today.