Many of you may not question this because generally UK fighters are developed more slowly but.... Why was Terence Crawford in his 7th year as a pro before going for a title?(I realize Crawford is from the USA, just saying it may not stand out as much because UK fighters tend to go through levels)

For the respect he gets on his talent his cv is rather sparse. Why isn't it ever mentioned? Even now there are much better fights to make at 140 than what they have made and there is talk of him moving on before making any of them. Why does he get a pass?