Simmonds plays less than 10 minutes a night on the 4th line. That is exactly what he deserves, unless we want to take him out of the lineup altogether (which I would be fine with doing).
Spezza at ES is cooked, but he still has value on the PP and in faceoffs... And even then he is only playing 11 minutes a night.
These two play the least amount of minutes, as they should.
Seems he learned from that Thornton debacle.
Ideally, I think you add another solid bottom 6er and then you rotate Spezza and Simmonds based on what you need in the playoffs.
As for Muzzin, he is still a guy who can handle big minutes. Just needs to be more of a stay-at-home guy than a puck mover like he was before.