I don't think you understand what that concept means. Having a situation "by the balls" means one party has significant leverage over the other. Such as Nylander having Toronto by the balls resulting in the team scrambling at the last second to offer him exactly what Marc Savard said he would sign for a week before the contract deadline.
No one team has leverage over Carolina simply because Carolina has an excess top-4 RHD. Because there are 31 teams in the league. All teams looks to make moves at varying points of the seasons for varying reasons. Top-4 RHD are relatively rare commodities in the NHL. Given that guys like Pesce and Faulk were rumored as the best offers that Toronto received for Nylander, it is easy to speculate that they will again be the best offered pieces for the next sticky team/contract situation. The Canes have plenty of time to work it out.
Nah I do understand.. In case you haven't noticed my other team have needed defense for a while and teams are waiting them out because they know they are desperate. However I am not about to go down this rabbit hole this has nothing to do with the Leafs or the Nylander negotiation.
Simply being a RD doesn't mean anything honestly. Adam Larsson trade completely screwed expectations because Chia is an idiot. Since that trade RD have returned nothing close to that level of return.
Karlsson got a bag of pucks
McDonagh got a mediocre forward and a bunch of meh AND they had to add on top of that.
Ian Cole got a 3rd round pick at a time he was seen as a solid #4.
Not going to keep going but the point is, no one will overpay when they know Carolina needs scoring desperately. You'll get a lot of situations LIKE Nylander where they say nah Pesce/Faulk isn't good enough we want Slavin knowing full well that won't happen.
Now consider during all of this that the guy doing the negotiating is Waddell....
They've got us "by the balls" because every team in the league knows that there are several better D on the roster and every year the playoffs slip past them the team gets more and more impatient. Look no further than that Skinner trade.