Voted for Hart but didn't expect this differential.
I also voted for Hart, but I think in general people underestimate how hard it can be young goalies to put up a high SV% in the AHL. This is a quick list of young goalies in the AHL in 16-17.
http://www.quanthockey.com/ahl/en/seasons/2016-17-ahl-goalies-stats.html
Zane McIntyre (2010, #165) - 31 GP, .930
Anton Forsberg (2011, #188) - 51 GP, .926
Tristan Jarry (2013, #44) 45 GP, .925
Garret Sparks (2011, #190) - 31 GP, .922
Ville Husso (2014, #94) - 22 GP, .920
Steven Michalek (2011, #161) - 30 GP, .919
Nick Ellis (undrafted) - 34 GP, .918
Malcom Subban (2012, #24) - 32 GP, .917
Charlie Lindgren (undrafted) - 48 GP, .914
Jack Campbell (2010, #11) - 52 GP, .914
Alex Lyon (undrafted) - 47 GP, .912
Jordan Binnington (2011, #88) - 32 GP, .911
Anthony Stolarz (2012, #45) 29 GP, .911
Jon Gilles (2012, #75) - 39 GP, .910
Linus Ullmark (2012, #163) - 55 GP, .909
Vitek Vanecek (2014, #39) - 39 GP, .909
Laurent Brossoit (2011, #164) 21 GP, .908
Thatcher Demko (2014, #36) - 45 GP, .908
MacKenzie Blackwood (2015, #42) - 36 GP, .907
Adin Hill (2015, #76) - 40 GP, .906
Eric Comrie (2013, #59) - 51 GP, .906
Spencer Martin (2013, #63) - 50 GP, .904
Marek Langhammer (2012, #184) - 25 GP, .902
Chris Dreidger (2012, #76) - 34 GP, .900
Eamon McAdam (2013, #70) - 26 GP, .897