Lotta threads all around this, so maybe this is redundant, but feels like there's some reality checking necessary.
Bruins have 11 forwards not named Savard on the signed NHL roster. They have 6 D not including Bartkowski or confirmed departee Ference. And they have 0 goalies. This leaves them with $5.8 M for two goalies and a forward at minimum. Savard on LTIR brings that up to $9.9M for those three players. Rask will be ~$6M of that. Providence callups for the other two jobs = $1.6-1.9M depending on the forward. Let's round up and say that right now, the Bruins have about $2M of wiggle room to fill out the roster before considering moves that lead to further holes. For example, a Peverley buyout or a trade for picks reduces the cap by $3.25M, but now you have to replace him. $5.25 might be enough for Horton to stay, and that would shift the roster spot filled by a call up to the bottom 6.
Except, if you want to carry 7 D (they always do) then you need another $650K for Bartkowski. So Horton's now looking unlikely at $4.75M.
So the existing lanscape is probably this:
Soderberg-Bergeron-Marchand (flipped due to CS's blind eye)
Chara, Seidenberg, Boychuk, McQuaid, Krug, Hamilton
Maybe this lets them carry Bartkowski and an extra rook to spell in on the fourth line.
I don't see a lot of changes to this, to be honest. Line juggling to start the year and a deal if things are going poorly. Maybe a stretch if there's a guy who is available due to the Cap situation, but that's the wrap.