Wow, that is extremely generous.
Along with Blaine Lacher, he took the league by storm in 1994-95. He was 7th with a .913 sv%. In 1995-96, he was definitely a very good goalie but his sv% of .906 was 15th in the NHL, nothing too special. It was the 9 shutouts that seduced the voters.
Surely you mean "he was above average for two years".
Carey's Vezina is highly suspect. Hasek had an off-year but was clearly the best goalie in the NHL. As usual, he led the NHL in sv% but had only two shutouts. Think about this: If one goalie is .906 with 9 shutouts, and one is .920 with 2 shutouts, what are their sv% in non-shutout games? Scary.
Carey also had a highly effective Washington defense of Johansson, Tinordi, Cote, Gonchar, Reekie, and Johnson, with 20-year old Brendan Witt as a #7. Hasek's defense corps was Zhitnik, Galley, Astley, Wilson, Huddy (at 36), Houda, and Boughner.