In this AGM, Canucks hire Claude Julien, as it's rumoured (Benning worked with him in Boston), and they go full Bruins.
Krejci:
Idk what Krejci would get on the open market but at his age, his past contract, and the flat cap environment I'd have to guess that his price would be highly effected. ($3.5M - $4.5M at probably 2 - 3 years).
Chara:
if he's interested in playing another year, Chara would have his old coach and a familiar face in Julien and Krejci. Probably a league min one year deal.
Halak:
He's the third guy in Boston right now and would want to have a spot as a 1B/Backup option somewhere else. He makes $3M right now, so he probably doesn't make that on his next contract. Halak most likely gets $1.5M - $2.5M for a max of two years where ever he goes.
Edits:
Because Hoglander wasn't on the starting night roster, his cap hit was set to $1.1M (doesn't have bonus overages).
Hughes maxed out his bonuses $700K (the minimum you can put is $750K so that's why it says that).