Quoting: OldNYIfan
I agree wholeheartedly with everything you say after the first five words, which keep me from understanding the counter-argument you seem to be making.
What I am saying is, pending UFA or not, the player's value is traded for as though he were already signing an extension that is often discussed in the talks prior to the trade. The market for a player like Karlsson is still significant, because it operates under the assumption that the groundwork for an extension has been discussed and factored in between Karlsson and the GM trading for him.
In this specific trade scenario, I can just about guarantee that Justin Faulk is never removing Ottawa from his list of teams he is declining a trade to (15 team list, no chance he approves a trade to Ottawa). Even if he did permit that trade, this return needs to add at minimum a high end prospect and a 1st round pick (because, as I mentioned, for Carolina to even attempt this trade, it is safe to assume they have already spoken to Karlsson about that extension).
Karlsson's value, although maybe not 4 firsts, is still significantly higher than this trade offer, unless it comes with Bobby Ryan's contract as an anchor.