To me this seems like Glen's just trying to repeat last season's rally. Glen is desperate as there is little doubt if the team does not make the playoffs his contract will be terminated. His tantrum could also be an indicator he has lost the ear of the team i.e. not taking his system seriously enough anymore. I trust the team more than him and we have always had a reputation for hard work. I seriously doubt Gio or Monahan were slouching. In fact, our reputation for hard work at practice often made me wonder if we were overdoing and not leaving enough in the tank to really excel during games. Therefore, my assessment is either Glen has lost the ear of the team, Glen is frustrated that the team isn't practicing the exact way he wants them to, or he is trying to rally his team like last seasons second half run.
Regardless if we make the playoffs last year, I think Glen has shown he is not talented enough to coach a team in the NHL. He biggest weakness being he fails to utilize his players at the right time. As others have mentioned, always rolling the lines is not an accepted strategy. More aggravatingly, he fails to play those who are hot more than those who are cold. I also question his ability to help players who struggle under his system. My hope is that he is gone next season.