Anyway, some other details that'll need to be sorted out:
Part of next year's cap preview is couched in the idea that Mike Reilly will spend his last season buried in Providence. Depending how things go, that could be moot (if he's traded) or wrong (if they move a defenceman without replacement and he has to come up). So it's his cap hit less $1 million if he stays buried, or full freight if he's with the Bruins.
The prominent guys in Providence right now that will be RFAs with arbitration rights are Marc McLaughlin and Brandon Bussi. I can imagine two way deals may suffice for both, but the reality is at least one of them is likely with the Bruins next season, so we'll have to see.
Doing this up without any idea of what Bergeron wants to do may be a fool's errand, but I don't think you can afford to take too much time to find out. We're about a month and a half away from the close of the current season, then they have to start filling the holes for next season. And considering Bergeron, along with Krejci, really have nothing left to prove at this point, I don't really see either coming back. That said, I'll take being wrong.
But, to give everyone a visual of what they're likely up against in the offseason, this is what they'll have far less than $6 million to fill:
Marchand/Zacha/Pastrnak
Hall/Coyle/DeBrusk
XXX/Frederic (my WAG: $2.5m AAV)/Lauko (WAG: $1.5m)
XXX/XXX/XXX
McAvoy/Grzelcyk
Carlo/Lindholm
Forbort/Zboril
Ullmark
Swayman (WAG: $3m AAV)
If my WAGs are accurate, that $6 million is now down to less than $3 million to find a 3LW/RW (Lauko can do both, apparently), an entire 4th line, and any extras they want to carry for injuries/illnesses through the season.