I'm going to guess that the holdup to the TDA trade is the Karlsson talks. The way that the Canes keep having leverage in trade talks is because they have cap space and can run the current roster with no issues at all, but I'm not sure if the Canes truly want Karlsson or if they see the opportunity to weaken a division rival even further when it comes to young assets and picks (which Pittsburgh is severely lacking). Simultaneously, if the Canes and Sharks somehow agree to an EK trade, that drastically changes the calculus of the blueline. It may well be that the Canes just need a stay-at-home guy (Jones, Holden, or Benoit, perhaps?) to pair with Chatfield for the bottom pair instead.