i think kotkaniemi is actually on a pretty fair contract and still has upside
Kotkaniemi's contract is currently one of the worst in the league. He may actually underperform his salary for the duration of the contract which is 5 more years and it is a significant risk assuming he will turn it around.
However, there was a rumour that the Rangers were looking for a 2nd for Lafreniere 2 years ago but there were no takers so players do turn it around.
The likely reason Kotkaniemi is linked to Necas in trades is that Carolina is a hard analytics team and they realize the risk Kotkaniemi's contract represents and want to flog Kotkaniemi's contract now and linking it to a Necas deal is the most prudent way to do it.
However, if the trade is reasonable it should be worth considering it but unless you are playing Kotkaniemi on left wing or as the 4th line centre it means they aren't bringing Lindholm back and if they acquire Kotkaniemi and resign Lindholm they probably aren't bringing Blueger back unless one of them plays the wing.
Cap space may prohibit any of these moves unless they create a Robidas Island near Tofino on the Wet Coast.
Interesting to watch.