The NHL is where the money is. You have to be patient. It took a few years, but Kuznetsov did come over. Ditto Kaprizov and Sorokin.
Slavin turns 30 in a few months. The same is true of Skjei and Pesce. The core of the defense is middle aged in hockey years. Nikishin will be a shot of high potential youth exactly when its needed.
Going back to Kuznetsov, Washington had been trending downwards from a President's Trophy peak in the years before his arrival, culminating in missing the playoffs in 13-14. He was as advertised and the Caps proceeded to have another high peak in mid to late 10s, including the cup win.
You want to talk about competing at a high level for 10-15 years, an unexpected draft W is how that happens. Nikishin is potentially a big deal; they have to see it play out.