The concept of opportunity cost is certainly not above my head, quite the contrary. Signing Kane doesn't prevent us from making a move "that actually helps." Trade Vic 50% retained for a 7th, sign Kane for $3M for a year, plenty of room/assets for other moves in our bottom 6. We aren't making a splash trade for a top 6 guy that requires us to have $8M in space. That's just not in the cards with our future plans.
Now if by opportunity cost you're just projecting that Adams only has a single move in the chamber and is unable/unwilling to do anything more than that, then sure I may not want to use it on Kane. But I don't take his cautious approach thus far to be a forever quality, more a product of where we have been in the build until now. I think he's willing to make more moves as the team warrants it and this may be the beginning of that. Also, there have been like two trades in the league this season, he isn't exactly an outlier at the moment.
I call BS on it being a "lazy PR move." That itself is a lazy rhetorical jab just used to reinforce skepticism of the move. I understand the rational points re: the potential downside of Kane without needing the conspiratorial take that an extra $30k at the gate matters.
Bottom line for me: one of the BEST PLAYERS OF ALL-TIME (who is bad at defense, but not nearly as fried as people are making him out to be) is available for a no-asset acquisition. It would be mismanagement to not kick the tires. Those with a negative opinion of the move aren't letting themselves consider how incredible it would be if it works out, while I am fully cognizant of how frustrating it would be if it doesn't.