In fairness, he is 21 years old, and has 1.5 NHL and 0.5 AHL seasons under is belt. I can understand that the Hawks may not have liked how he was progressing and that's fine and a good reason to part ways if that's the case.
But did people really expect that a slight guy selected 18th overall would be lighting it up 1.5 years into his NHL career? 13G, 35 points seems to be decent for a guy in his first full NHL season, that is the 8th forward on his team for PP TOI/GP, 7th forward on his team for ES TOI/GP, who's most common linemates ES were Desjardins and Kruger, who started in the D zone 43% of the time, was a positive possession player and went against decent competition.
I didn't get to see a whole lot of him so I'm curious what the expectations were given those parameters?