Pretty sure that Sully always keeps Blueger on L4 despite injuries. At least he did when ZAR was a thing.
He keeps the unit together, and the unit often keeps the title L4, but they routinely get a ton of ice time. There was a period - I think when GMR were rolling - when Blueger was our de facto 2C.
Eh, Sully was leaning more on Carter to take some of that load when Blueger was out and Poehling was the 4C. He's more apt to play Blueger 13-14 minutes per night, which is higher than your typical 4C. He just doesn't seem to believe Blueger should have any *offensive* minutes.
This, although the bit where he doesn't hand out offensive minutes to 4C is fairly regular.
And in any case, you can spin that as a total lack of belief in Blueger offensively, or a total belief in Blueger defensively, or a belief that Blueger doesn't need offensive deployments to get his numbers, or a belief that the lion's share of offensive minutes should go to Sid and Geno.
Just like you can spin this summer and its rumours as Hextall not being sold on Blueger because he allegedly offered him to Montreal, or being very sold that he kept him despite the fact that doing so has displaced two of Hextall's summer acquisitions.
The truth probably lies in between all of those things, and we will see just how much they value him this summer, one way or the other. I suspect they're maybe waiting to see if he carries his regular season through to the playoffs as much as anything.