The Seattle Kraken are one the newest expansions to the NHL, it has quickly become the model for future expansion teams. The Kraken have escaped the usual struggles that expansion teams have faced in the past.
The NHL has learnt from their experiences with the Senators, Ducks and other expansion franchises, and have allowed Seattle to develop quickly. The fact that the NHL charges $650 million to join the league and the recent renovation of the old Key Arena Complex have certainly helped Seattle.
Fans also love to buy NHL jerseys, so it is not surprising that Seattle has decided to make a new, special jersey that they can sell.