Just my own personal opinions on these
Toronto receives:
PK Subban @ 50% retained salary
New Jersey receives:
Kasperi Kapanen
I think Subban to the Leafs makes sense. I think that with retention, there would actually be people interested in Subban. How much? I'm not sure. But despite the interest I think would exist in Subban (again, particularly with retention), I will be damned if I could figure out his value. I don't think it's Kap though. That seems high. I mean, honestly, I wouldn't be surprised if a Subban retained deal got something like a 2nd / Dermott / Timoshov. Or I don't know, maybe instead of Timoshov it's Kerfoot or something. I don't know. Maybe it gets a little more since this deal may actually be lighter than the one the Devils gave up to get him at full salary (though I suppose that depends on how you feel about Dermott).
I think a deal involving Severson would garner Kap, but I don't know if Sevs is the type of defender that Toronto is looking for.
Vancouver receives:
Wayne Simmonds
New Jersey receives:
2020 3rd round pick
I'm not sure Vancouver can afford this salary wise, and you're already retaining on Subban and Vats, so probably would have to include Baertschi, which may change this into a slightly different deal.
Still, it doesn't have to be Vancouver. This type of rental works for a number of playoff contender type teams if they want it for a third round pick.
Vegas receives:
Kyle Palmieri
Sami Vatanen @50% retained salary
Kevin Rooney
New Jersey receives:
2020 1st round pick
Alex Tuch
Cody Eakin
Valentin Zykov
This is just a bad trade for VGK in my opinion. One, they are selling low on Tuch, which they shouldn't do, but if they are, they need to get a defender back with some term. Given how cost controlled he is and their cap situation, it makes way more sense for Vegas to count on a bounce back here rather than unload him. They also don't really need Palms.
This trade is probably just too complicated to me. If they are looking for a D-man, then yeah, rental Vats makes sense. Rental values will typically fit within a certain range, so lets just say one of VGK's seconds (can be whichever is lower) + one of Morozov / Dorofayev / Deliberatore (sorry VGK fans, I'm just throwing some non Krebs / Elvenes prospects at the wall here, I have no idea what their current status in your farm system). In order to make money work, Devils can take back Eakin or Reaves if necessary. Whomever makes more sense as a dump.
Edmonton receives:
Nikita Popugayev
2020 7th round pick
New Jersey receives:
Jesse Puljajarvi
Sam Gagner
I'm honestly not sure why Gagner is even in this trade? He's a free agent after the year and the Oilers aren't adding any salary that would require him to be dealt, and the devils don't really need to take him on.
Secondarily, I think it's just too low. I'm not say Pool Party is beastly or anything, but I think that there would be enough interest in a top 5 pick reclamation that he's going to warrant a lot more than this just from market demand. So I think this is just a bad deal for the Oilers.
I'd think something more along the lines of like Yegor Zaisev + mid round pick. The Oilers may not even have interest in that, but I Think that is something to at least consider.
Boston receives:
Brandon Gignac
New Jersey receives:
David Backes
2020 2nd round pick
2021 2nd round pick
I think this is fine. It's really hard to gauge cap dump type deals...I suppose it depends on what kind of bind a team is in. I mean, Marleau got a first for a dump. I can't remember how long was left on the deal though.