I'm not slagging Hamhuis or Corrado by saying this, but any decently mobile D who plays 2nd PP minutes can reach 25-30 pts in a season. I still wouldn't describe them as having good offense or as having high offensive skills. Fortunately for both they have other skills that guarantee/will guarantee steady NHL employment.
I wonder if people have unreasonable expectations of scoring in the NHL? Because in 2011-2012 (last full season) there were only 43 defencemen who scored 30 points in the NHL. Most of them were getting lots of powerplay time.
So offensively, if Hamhuis can be in that group (which he was), that places him in the top-60 dmen in scoring - mathematically a top-pairing dman.
Of course that only includes the offensive side... but for Hamhuis (and Corrado) their defensive game is by far the more impressive part of their game... so their should be no question Hamhuis is a top-paring dman.
So if Corrado can be compared to Hamhuis, that seems to imply he has potential to be a top-pairing dman. And if he can put up 30 points, that definitely puts him well within the NHLs top-pairing dmen in terms of offense.