I think the fact that you're comparing scoring between Ericsson and Quincey just shows the ridiculousness of this argument.
It should be obvious at this point that neither player is relied on for the offensive production so I'm not sure why we're using that as a measuring point for their value to the team.
It's a measuring point for Quincey because that's suppose to be the type of D-man he is. He's never been a shut-down or stay-at-home defenseman. So if he's bringing almost no offense to the table, he better be stepping it up big time on the defensive end. And so far he has barely showed up on the scoresheet and has been mediocre on the defensive end at best. If he were a high-level shut-down defenseman you would definitely have a point. But he's not (or even close to it). And the almost every game bonehead penalties seem to be the most consistent part of his game. So basically that's why people find it laughable that he is our 2nd highest paid D-man, and makes more $ than Jonathan Ericsson.