These are the kinds of trades acquiring teams regret deeply more often then not. Trading for a rookie at peak value is never a good idea.
Trading for a guy before there’s expectations on him and the league has the book on him comes with quite a bit of risk.
Trading for Xhekaj right now would require pry-away value because of the rapid progression he's shown, the unique qualities he has as a player (size, snarl, skating, smarts), and the potential upside he has being very intriguing.
And in that sense, any trade for Xhekaj would be truly unpalatable for NJ, also with quite some amount of risk involved since as you've said Xhekaj has yet to play enough NHL games to really show his true standard of play.
I mean no disrespect, but where I have some issues with your post is in your use of the term "peak" when it comes to defining Wifi's value. Without getting too ahead of myself here, I personally think it is WAY too premature to outright state that Xhekaj's trade value will never grow higher than it would be in this hypothetical (and extremely unlikely) event of a trade to NJ (and yes, it could also fall much lower don't get me wrong, that's not the point I'm making).
Simply put, the future is uncertain.
Xhekaj could very well end up simply being a third-pairing/tweener guy that you put on for toughness (kind of like Luke Schenn before this year). It is also possible that he could get injured and become unable to play in the NHL after a couple years. Or, he could have a long Ed Jovanovski type of career. Maybe even take everyone by surprise, develop like crazy and end up being a modern Rob Blake. Or he could also end up dying tomorrow or another day in any kind of gruesome and senseless way.
Yes, both extremes of the spectrum are VERY unlikely, and the middle-range (as yet more or less undefined) of those various possibilites should ultimately be where Xhekaj lands pertaining to his career and value around the league as an NHLer, but stranger things have happened.
We simply don't know yet. And that's the whole beauty/chaos of it all.
In the end, we should postpone judgments either way and just keep watching Xhekaj play as he tries to establish himself in the NHL, keeping a level-head all along. We should also exhibit more restraint when responding to posters with different perspectives/favored teams since it helps us engage in more fertile discourse about prospects/teams/current players.
Anyways, that's it from me. Cheers, and have a good night.