I think if they had any idea of making Duncan manager they would have done so by now.
He could have been appointed until the end of the season and then review what route they would like to take.
It looks as if they want a full time manager asap and I think it will be Lampard or Rooney if agreement could be reached with them.
I would largely ignore the links to the several managers we have been linked with. There have been a couple of names that are mentioned every time, a couple that would be popular with the media and a few that would appear to be obvious targets like Potter, Lampard and Rooney. Last time we were appointing NES if you believed the reports and RB came relatively late largely because most believed it would never happen.
I think it prudent to enquire about the availability of a number of managers that may be of interest.
The media rank them in order of favourite but we have no idea if they are correct.