Bottom line, and this is what this non-stop back and forth seems to reflect, is that there are two camps. One camp wants McI to get a consistent chance, and thinks the problem is with AV. The other camp loves AV and thinks McI is his own biggest problem.
Neither side seems likely to convince the other, but if you ask me, you should be far more concerned about the foot of real estate at the top of Vigneault's frame than the one at the top of McI's.
AV has a loooooong track record for making the wrong decisions about defensemen. He's shown the door to three d-men who he insulted, thought "didn't fit his system," or thought were being carried by a partner who was dearer to his heart. All three are now first pair defensemen for other teams.
This isn't an issue of McI in isolation. This is McI as one in a series of AV screw ups, and at least to me, I'm sick of seeing AV's incompetence lead to lost resources for this team.
Every season, this team loses more resources and gets diminishing results. Fire him now before we look like Vancouver when they finally wised up.