As the West becomes more competitive and we lose Marleau and Thornton declines, it's important to note that backup goaltending like Stalock in 2015-2016 could be enough to push us out of a playoff spot. If you have a reliable backup like Dell it's probably not bad to pay him that extra million to keep him. The alternative is Bibeau at around $900K which could work out well but could also screw us out of the playoffs.
In fact, with some of the performances Dell has put up this season given the circumstances and where we are in the standings, you could probably make the argument that we would be out of a playoff spot if we had a league average backup.