If you're confused about why the Hurricanes would consider using the buyout window considering they have approximately $6.44 million let's try to make it a bit clearer as it's a bit misleading. They still have 22-year-old RFA Seth Jarvis to re-sign as the winger wasn't eligible for arbitration. He's coming off a breakout season which saw his record 33 goals & 34 assists in 81 regular season games. He's likely billed as being a core piece down the road if he isn't already.
If the Hurricanes can, they'd probably like to sign Jarvis to a max-term agreement, which buys them another four years of team control. But with their cap situation the way it is, something needs to be done. This leads to the topic at hand, buying out Kotkaniemi.
Because he's only 24, the buyout is one-third, not the standard two-thirds. The total buyout for Eric Tulsky would be $3.985 million which would give them $10.425 million which gives them ample space.