For VAN.
For BOS it's an increase of $2m on the cap, considering Reilly is in the minors. If they make the deal and waive Pearson and send him to the minors, then BOS is spending the extra 250k on what they'd be charged for Reilly.
This is a simple thing: Either the B's pay someone to take Reilly or they keep him in the minors.
There's no reason to add more $ to the cap while not improving their team at all.
If nobody is willing to take Reilly with a sweetener, and I can understand why they won't, then they do nothing.