the problem I have with this assertion, is that the Canes are in a cup window right now, and there's not guarantee that window will last too long depending on what guys like Aho, TT, Pesce, Skjei, etc.. do. Both goalies are around for 1 year more (Kuchetkov has looked promising though).. Pacioretty was a 1 year deal. Burns isn't getting any younger. I get you are saying "long term", but they certainly pencilled him in short term and hoped it would blossom into a long term thing.
I disagree Trocheck is the wrong comparison. They didn't make any move to replace Trocheck other than sign KK and move him into that role. There were a number of rumors as to who the Canes were going after (Kuzmenko, Pacioretty, Tkachuk, Marchment, etc..) and they are all wingers. Therefore, their actions of not "apparently" going after another top 6 center and with the team aspirations, it's an apt comparison right now. It's "last year's 2C vs. this year's 2C" which is valid.
I agree if he ends up being a good 3C long term it's still a good deal and nobody is complaining about that, but we need a 2C now and a lot can happen between now and down the road.