Florida will have many RHD unable to protect from expansion. Yupp, I'd consider Pysyk, maybe even Petrovic as an upgrade simply due to handedness.
Detroit might think of moving Green and please, do not tell me Russell is better, that's just some blind homerism.
NYI might have to move a dman.
The Jets might as well. I could see either Myers (might be) or Trouba (doubt he comes to Canada).
Columbus has excess defensemen. Savard is an interesting name.
Kris Russell is the absolute bottom of the barrel. That's why no one signed him last year until training camp. Be better, Pete.
Green - Soft, offensive defenseman who plays a high-risk offensive game. Also probably costs you a big as a one-year rental. Pass.
Pysyk - Played 18 minutes a night, 3 less than Russell's 21. Had some decent supporting stats but Panthers fans don't seem too enthoused about the potential of him moving up the lineup.
Petrovic - I dunno, man. If he was replacing Eric Gryba, I'd be all for it. But moving a guy into the top four with supporting statistics rivalling that of previously mentioned Eric Gryba is risky to say the least. I don't know enough about the player to make a fair assessment of him, but as a guy whose never played over 18 minutes a game in a season, he's a guy you make earn a role. So as a Russell replacement, no. Gryba replacement? Absolutely.
The Islanders - Hamonic? Not available. Boychuk? Too expensive. Pulock? Too green.
Myers - Will he play again? Is his heart still in it? Not the worst target honestly but that second year needs to be offset because they're not taking Eberle. Pouliot would need to be part of the deal.
Trouba - Pie in the sky.
Columbus - Savard? Not available. They'll trade Murray for futures.
Russell is proven here. We own him and he did well. As mentioned, the Oilers are committing additional assets to any 'upgrade' you suggest.