Since when is a 6'1 player considered small?
I don't think anyone is really "worried" about Nylander. Disappointed a little that he wasn't more dominant in the A, even at 18. However 28 pts in 65 games is .40 p/gp isn't horrible for a 18 year old in the AHL. It was certainly better the Zemgus did in similar circumstances a few years ago when he had 17 pts in 61 games for the Amerks.
Where the disappontment comes in was in comparing him to his brother. William was the 8th pick in 2014. In the season following his draft, he split time between the SHL (20 pts in 21 games) and the AHL (32 pts in 37 games).
William did do better his 1st year in the A, but he actually got to play on a AHL team, not the tire fire the Amerks were.
Hopefully passing on Chychrun/Sergachev works out.