We had many advocates right here that were high on Petry when he was in Edmonton. And subsequently disappointed when the Wings didn't land him.
I was one. Said at the time he was better than DeKeyser and it wasn't particularly close and still believe that today.
Petry wasn't nearly as bad for the bad Oilers (who were worse than these Wings) as DeKeyser has been this year. So no, Petry significantly outplayed DeKeyser when their situations have been similar and when on a good team he outplayed him significantly there as well. Primarily because he is a much better second pairing D-man than DK in my opinion.
For those of us worried about flipping him for Trouba like it was some kind of lateral move, well there is some egg on the face. Our D-core would be better in that kind of swap even while damaging the wing to give up better assets. Oh well, I don't expect DK to be moved, but nobody should be worried if he does, he is a mediocre 2nd pairing D-man in my opinion.
He should not be left exposed in the expansion draft though as he does have some value at least he should depending on just how bad his play continues to get in the second half. It is in a pretty deep spiral right now, hopefully he bounces back after the break.