it's not about prowess, it's about paydays.
As long as Hatton and Calzaghe keep winning they keep bringing the cameras which means Pay par view dollars etc.
Witter and Froch are good fighters but they don't bring the cameras and until they do they can forget about getting a big fight with the more famous fella's.
These decisions are made by promoters and managers who 'know' where the money is.