If you base the award on the past two years, Chia is a slam dunk (Kass, Maroon, Talbot, McDavid, Sekera, Klef extension), but I'm not sure his work over the past year alone (Hall/Larsson, Lucic, Russell) is the best of any GM.
Credit where credit is due though, he (and McDavid) have turned the Oilers from a laughing stock to a contender.
Hey, you forgot Desharnais!
Besides, if the award were for only this year, Chiarelli would be a shoe-in. That would mean that Dorian's main moves were the Brassard trade and getting Burrows. Poile's only major move in this time was trading for Subban, and quite frankly it was likely a trade driven by Montreal more than Nashville.
But imo it's not an award based only on one year. It's a general impression thing. Poile's been nominated a lot but never won, and it makes sense for him to win now. Over the years he's brought in Subban, Neal, Forsberg, and others. He's had to deal with Radulov, Suter leaving, and Weber seemingly wanting out with his offer sheet signing.
Dorian's made some good deals too, and is dealing with a challenging ownership issue, but imo he's Poile-lite for this award.
Chiarelli is worthy based on the last two seasons, but imo I could see it just not being his time yet. The team was helped tremendously by him, but imo it was one of the more flawed rosters in the playoffs still. Chiarelli needs at least one more strong off season and mid-season to really prove his mettle.