But they have been top 7 at least in scoring every season Crosby has been healthy. So if we're talking about it being necessary to maximize the team's offensive production it hasn't seemed to matter who is playing with Crosby - the goals have still come regardless.
I'd say that's because of how Crosby makes everyone better. In 2009-10 for instance, Crosby had 109 points and played mostly with Guerin/Kunitz (but Kunitz was injured part of the year) but at even strength Crosby put up more points with Letang/Goligoski than any of his wingers.
Kunitz getting 30 is really just a function of him being the first winger to play so much in a season with Crosby. Of Crosby's ~979 5 on 5 minutes this season, Kunitz has played 808 of them.
From 2008-2013 these are the 5 forwards Crosby has played the most with, and the Penguins goals per 20:00 with them on the ice together:
Kunitz: 1.45
Dupuis: 1.36
Malkin: 1.76
Guerin: 1.23
Satan: 1.1
The numbers are similar with the D - when Crosby and one of Letang, Orpik, Goligoski, Martin, Gonchar are on the ice the GF/20 are all 1.3 or higher.
If the original point was that not just anyone could be Brendan Morrison, or in this case, Chris Kunitz, shouldn't there be some very clear benefit to the Penguins overall to having them together? A significant uptick in the team's offensive production when they play together?
I'm not seeing a significant difference when it is Kunitz/Crosby, other than in Kunitz' individual production. The Pens seem to put up a ton of goals regardless of who Crosby is on the ice with - so why does it matter WHO it is with, other than their individual stats?
No, not everyone can score with Kunitz' SH%, just like not everyone can with Bozak's, but in both cases the stats tend to show that you could put anyone in Kunitz' or Bozak's position and the goals would still come - maybe not necessarily from whoever you put in that position, but the net effect for the team should still be similar.