Let me be very clear, I do not support Glendening playing on the second line but I do have a couple of thoughts:
1) What have any of the names below him done over the last 10 games to justify top 6 minutes? Nyquist has 3 assists in his last 10 games, Sheahan's struggles have been discussed extensively and Helm has disappeared. Mantha should probably get a chance, but his 3 points in 11 NHL games isn't exactly inspiring. The rest of the bottom 6 aren't even worth mentioning. Many have asked for a merit based ice time structure; this is the result when your scorers aren't scoring.
2) Glendening has experienced decent success playing against TJ and Kucherov. Given Blashill's modus operandi I would imagine line 2 will be used in a shutdown role.