I say pass on Brock Nelson and if we are going the addition from outside of the organization, it should be a big swing or nothing at this point. We have no shortage of middling players, we are lacking impact/high end players. If you can sign a Marner, Rantanen, or maybe Ehlers, or work a trade for a similar impactful top of the lineup player, then keep sucking and try finding that type of player with a high '26 first round pick and take a run at whichever of McDavid, Eichel, Kaprizov, Conner, or Necas make it to free agency.
If we could convince one of Rantanen, Marner, or Ehlers to sign and we end up with one of Hagens, Martone, or Misa out of the draft there is light at the end of the tunnel. Adding Nelson without an elite forward is still likely a non playoff team for '25-'26 (even if Nazar and a few other prospects have perfect develop this year), but one likely picking out of the top 10 instead of again with in.
The best place to find elite forward talent is in the top 10 of the draft. Adding Nelson decreases the odds of picking that high.