The New York Rangers lucked out when Henry Lundqvist was moved, as they had Igor Shesterkin fall right into the starter position. No team has been as lucky in transition, from a future hall of Famer to a Vezina Trophy winner.
In three years on NHL ice, Shesterkin has a career SV% of .928, with a 2.44 GAA. Without these solid numbers, the Rangers would have had trouble making it so far last year.
The Rangers didn't change too much overall in the off-season, defensively and while losing Andrew Copp for Vincent Troecheck is a move that is more lateral offensively, I don't see Gerard Gallant running into issues with defensive production.