No. He should just fight PBF, Cotto, Margo-williams winner and maybe even Juan Diaz to become the pre-eminent fighter of his generation (ie not the Mosley, ODLH lot - they're really a slightly different era).
Any real quality fighter should be able to freely move through the divisons where Duke fought, it is just easier to do down there.
Expert in his strange way has raised an intersting point..... Guys get recognition history wise by either their domination of one particular division or fighting all the available elite competition. Hattons management need to be careful or he might do neither.
Hatton has already got his fair share of alphabet crap... He is a whole above McKenzie; unlike Duke, Hatoon has become a Champion of the World (at 140lbs), and if I was him, I would only be intrested in big money and as easy as possible fights from now on.