Some gut feelings:
RhD Josh Manson, ANA --> either TOR or NYI
Both have lot of forwards to give for a rebuilding team. Think Toronto being more desperate and giving Kapanen, but also getting Carter Rowney or Derek Grant in the trade. Letting Kapanen go would be being short of penalty killers, when Trevor Moore was traded earlier.
RhD Mike Green, DET --> Vegas or Calgary (both have need for RhD) better fit: Calgary
RhD Sami Vatanen, NJD --> Vegas or Calgary, better fit: Vegas. They need the better player (which Vatanen is), cause/and Calgary injuries are not season-ending. Green better fit for Flames as instant help and playoff depth.
Columbus could also join on this "club", thanks to injury of RhD Seth Jones, could also go after Manson.
LW Chris Kreider, NYR ---> TBL, they just want more net-front precence, kind of "upgraded Maroon", and have that continuous trade-connection.
LhD Alec Martinez, LAK ---> FLO, biggest need left-handed D. St. Louis could also be interested (Bouwmeester-case)
RhD Matt Dumba, MIN ---> CAR
Minnesota is gonna trade either Brodin or Dumba. Pittsburgh would prefer LhD (Brodin), but don't have anymore youth material to give for Minny.
Carolina goes after Dumba (RhD Hamilton injured) and they have lots of young players to give for Minny. Pittsburgh has to go with the cheap option:
LhD Trevor Daley, DET ---> PIT (for low pick)
W Darren Helm, DET ---> EDM. It just happens. Stanley Cup winning experience to Oilers. Holland always will add some depth. (50% retention, for a pick, not a 1st). Jurco - Sheahan - Helm also have played a lot together formerly.
RW Tyler Toffoli, LAK ---> STL or BOS. This will be a huge bidding war. Both will prefer a right-handed scorer.
If Tarasenko won't return at regular season, STL will go hard for Toffoli. If he returns, STL interest could change more of replacing Bouwmeester. Then Toffoli will end up to Boston.
F Andreas Athanasiou, DET --> STL or BOS. Who does not get Toffoli, will go after AA. But they could also face a surprise 3rd party destination: Colorado Avalanche. Maybe for Zadorov.
C JP Pageau, OTT ---> NYI/VGK/COL. Really tough to pick this destination. All contenders have good center core. Colorado a possibility, if Athanasiou goes elsewhere. I say NY Islanders, because they are a bit weak from center, and main PK player Clutterbuck is injured. And Lamoriello likes to get as defensive as possible.
Some LhD ---> STL. If Bouwmeester career will end, they'll go after someone, like Ron Hainsey from Ottawa, maybe?