They are already using it. With all the injuries and having to move players in and out of the lineup, the cap space is extremely valuable. For example, just between Wednesday and Thursday, their deadline cap space dropped $7.5 million. That will continue to fluctuate as players move in and out.
I would much rather that than having to move players in and out of LTIR and having virtually no space come trade deadline.
The cap is a long, tedious and extremely complicated thing to keep track of. I think the Bruins have managed it masterfully.
I guess it depends on your definition of using it to their full availability. But the B's are in much better shape than the Lightning, Caps, Islanders, and many more. Heaven help them if they suffer injuries where they can't put players on LTIR like the Bruins.
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I keep my own tabs on the cap. Usually tweet it out every game day.