That remains to be seen, so many people make the mistake (including the OP) of making a statement like that based off of his prior success, when in reality you have to judge or predict what he will contribute going forward.
As I stated. unless the Cowboys make a move with the Dez dollars (i.e. a trade for Earl Thomas or a player of a similar ilk), most knowledgeable football fans will tell you that Alan Hurns alone is not an upgrade on Dez. If we draft a WR in the 1st round because of the Dez cut, then we are taking away resources that could be spent on another position of need.
As big a Romo fan that I was, I think that Dez might end up being a worse cut, if we are unable to find a LB who can contribute at a high level because we blow pick 19 on Sutton to try and teach him to be the next Dez. That would be a crying shame.
Sutton could end up being something special, but as an NFL Receiver he is a project at best (and had an even less evolved route tree and was a less talented route runner than Dez coming out of college).