I don't really know if the Isles would be good with Nelson let alone Strome TBH. (They wouldn't be good with either according to their fans on HF). Strome may have some higher upside, but Nelson is looking pretty good too. He's bigger, a little further along at the moment, and many Islander fans have him as possibly JT's winger on the 1st line next season. He was pretty good in the WC's as well.
I might take flak for this, but if it came down to it, and someone unforeseen was at 5 (say some combination of the Panthers moving and taking Nylander, the Flames taking Ritchie, etc), and you have a guy like Sam Bennett sitting there, I would probably move Kane and our 9th for the 5th and Nelson. I think Nelson could give you 70% or more of Kane's production next year, and the difference between a Bennett and a guy we're likely to get at 9 could be significant.
Now I don't know why the Isles would be willing to move their 1st to try to get better immediately, but would want a pick back as part of the deal. They'd probably want a roster player instead of the 9th. But that's something I would probably do from a "value" perspective. As Guerzy posted, maybe replace the 9th with Buff, but get something back like a Cizikas.
Kane + Buff
For
Nelson + 5th (only if it's a faller like a Bennett) + Cizikas
That's a pretty aggressive trade for the Jets IMO. We'd be worse next year swapping Kane and Buff for Nelson and Cizikas. But we'd be younger and cheaper, and if the Jets used some of the massive cap and salary savings (10.42 - 2(guess) = 8.42 extra to spend) on another player the team could be the same or even better. Plus, they would be adding Bennett (which is why I would even be thinking about it) and heaven help us if someone else "drops" to 9 like an Ehlers?
The Islanders would be a better team next year for sure (if that's their motivation). Even if Nelson could put up 70% of Kane, the pick isn't going to be in the NHL, and Buff is going to be a massive improvement to their record over Cizikas. Their only downside is if Nelson develops closer to Kane, and the loss of the pick (which is compensated by Buff, who they could re-sign, of flip in two deadlines).
Try not to rip me apart too much, considering the trades we see in then NHL these days, this is pretty pie in the sky stuff. Just throwing it out there for fun discussion purposes.
Of course you posted this after my long winded one.
If we could get your deal, I would take it in a second. I think it's asking a lot though IMO.
Great discussion. The bolded is actually a trade I would do for your exact reason. I looked into Nelson after one of the posts above and he would be a good addition over Mayfield. I am big on Cizikas, he is just so reliable - reminds me of a Frolik with a little less of the offensive instinct.
.. I kind of think so with Garth being Garth. They need a top offensive defenseman, Byfuglien ranks atop the entire league there. Hamonic is their #1 guy on the right side, Byfuglien could slot in as the #2 on the second pairing, right side. He's got a Stanley Cup on his resume. And, he's locked up for the next 2 seasons, so he's a guaranteed player there. 
