Can I propose an alternative explanation? This doesn't alter your point, but I think it's important, and might even be the primary reason. Both Duffy and Dunk are slow, Webster is rapid. Potter wants to play a far higher defensive line than Hughton, and D&D are diamonds in a deep defensive...
Exactly but, according to NSC logic, because at that point Stephens was imperious in the Championship, Sidwell had nous, and Kayal provided bite, dynamism and physicality, then we had to have a pop at Norwood.
Norwood was quite obviously a serious talent, one of the most underrated players...
I think Swansman has again offered some decent analysis on this, as to your question:
-- yes, if we get a decent offer but selling him would mean that we'll need to get a better alternative -- not easy
-- I can't see the value of having Gross, Mooy and Mac Allister in the squad, chuck in...