Don't hold your breath on Jarvis. Horvat doesn't address a real need for Carolina. Elite scorer? Nope. Top pair RHD? Nope. Power winger to balance out the Finns (Aho and Teravainen)? Nope.
Carolina is good for this year up the middle with Trocheck. Next season is a question mark, but there are potential internal options (Necas making the transition, Kotkaniemi, Suzuki or Drury on the prospect front playing a 3rd wheel role on a line) if he doesn't re-sign. Not worth being proactive about.
Sounds like Carolina would have interest in JT Miller over Horvat then