I wouldn't read too much into these 5 on 5 statistics, as they can be very misleading.
Just take the recent Rangers game for reference. Vigenault would constantly match up his MacDonagh and Girardi pairing against our first line. While Backy got himself a pair of points, it was obvious already after the first period that this philosophy as a whole works very well against us.
Still this philosophy comes at a price, in the fact that your second line gets a lot more playing time against a lower level of defensive competition. Simple logic right? Pretty much explains why Grabo has experienced quite some decent point production 5 on 5.
Basically by shutting down our first line, the opponent opens up the flood gates wide open for our second line. This is in my opinion the real problem this team has. We simply aren't good enough in taking advantage of the quality chances given to the second line.
All our secondary scoring guys (Grabo, Fehr, Erat, Ward, Chimera, Brouwer, Laich), are either puck carriers or board players. Non of them are players with a shoot first mentality, though Fehr do have his moments now and then. All of these players still gets more quality chances though, as they will be getting minutes against a lower level of defensive competition.
What this team IMO truly needs is a second line player with a shoot first mentality, so that teams who decide to constantly lock down Ovy and Backy on the first line, are forced to do so at the cost of goals coming from our second line.
IMO, secondary scoring is the real issue, not the 5 on 5 production of our first line.