I think there is a basis, Nichushkin's numbers weren't bad until his big down D+4 season of 10 points. After that season he resumed his gradual improvement until he got to where he is now. They are on VERY similar trajectories right now. And sure, no guarantees, but it would be WAY more of an outlier for Kakko to have topped out last year at 21-22, with 40 5v5 points, even if this had been an entire year like his first (only so far) 20 games, than for him to be close to 60 points or more in his prime.