Yes more chance of Balogun going or being loaned out than there is of Dunk leaving l woul;d have thought. Then with Clarke being loaned out to Derby for the season we will have the same number of centre backs as last season in the squad, Dunk, Duffy, Burn, and Webster.
With the caveat of course...
I don't think Potter is keen to offload any anyone, he doesn't know enough about his squad yet. The only way Duffy would leave would be if the player himself weanted to go, or of course the club were offered a fee too good to turn down.