Chiarelli has made huge moves, retooling most of our roster. Lucic, Letestu, Maroon, Kassian, Caggiula, Sekera, Larsson, Russell, Benning, Talbot.
Lucic and Maroon are our two best LW's, although Lucic has struggled mightily recently. Letestu has been a very important player this year. Kassian is a huge addition to the team culture and provides something we once lacked. Caggiula and Benning were two very good college signings. Sekera, Larsson, and Russell have been our three best defencemen IMO. Talbot goes without saying.
He completed redefined the identity of the team. Sure, getting McDavid helps, but he has added our three best defencemen, our two best left wingers, our #1 PK forward, and our #1 goalie along with another defenceman in Benning who is playing lights out.
I think he has the case for GM of the year, especially seeing the change in standings after one year.