Jesus... I said "doesn't have much value for other teams acquiring him" and you then came back with "saying he has no value at all is ignorant".. you're comprehension needs some work. He's more valuable to New Jersey than other teams.
Zacha imo isn't even top 6 material and while still young enough to improve, is no where near the blue chip piece you hope to acquire when talking about Karlsson.
Woods is a 4th round pick (so not far off from a 5th) with decent size and speed but again is no where near a blue chip/top 6 piece you'd want FOR THE BEST DMAN IN THE F******G LEAGUE. He's a bottom 6 player for the time being.
So yeah, I'm brushing off Zacha and Woods because they are just decent pieces but not something I'd ever want or ask for when trading a superstar dman. How do you not understand that?
So, why exactly is Wood "more valuable to New Jersey than other teams"? What makes the Devils so special that they value him much more than all of the other 30 teams in the league? You still haven't answered that one, so let's hear it.
I'm also not arguing that Zacha is top 6 material or anywhere close to being the blue chip piece Devils fans hoped for when he was taken 6th overall. He likely won't live up to what Devils fans expected and he's yet to prove he's a top 6 player every night. But like you said, he's still young enough to improve so there is some value there as he just turned 21 in April.
Wood is still only 22 and put up 19 goals last season playing 4th line minutes with little PP time while also significantly improving his all around game in the process. What round a player was picked in is largely irrelevant as they put more seasons in, but yeah the fact that he's a 4th round pick (OH SORRY, LATE 4TH ROUND PICK!) and he still played nearly two full seasons at the NHL level before his 23rd birthday is rather impressive.
These guys aren't going to be the centerpiece of a deal, but you don't just discard the value they bring as you did.
As far as acquiring Karlsson, the Devils shouldn't have any interest. Zero chance he does a sign-and-trade - that's just a pipe dream for Ottawa fans that are refusing to accept the reality of the situation (you're not going to like the return when he's dealt) and have this fantasy of him signing a long-term deal prior to being traded to massively increase the return. Not. Gonna. Happen.
The window hasn't opened yet on the Devils being a Stanley Cup contender. Maybe they can build on last season's success with another trip to the playoffs, but I don't think they're serious contenders just yet. At least not this year. They only recently just replenished the farm system, so giving up what it would take to acquire a soon-to-be-UFA Karlsson (while expensive, but still below what Ottawa fans want) knowing he's likely to test the free agent waters just isn't worth the price the Devils would have to give up. And honestly, there's a lot of smoke around Karlsson going to Dallas or Tampa, so the Devils are probably not near the top of his list. Would be a huge risk acquiring him. They're better off just backing up the Brinks truck next offseason to see if they can sign him as a UFA (long-shot, I know) since they'd have the cap space to do it and by retaining picks and players like Ty Smith, would be a team on the rise with good young talent on the way.