New York Islanders Best Player Acquired Via Trade In Every Position

Goalie | Jaroslav Halak
The acquisition of goalie Jaroslav Halak was easily the best trade value for a goalie via trade. The New York Islanders acquired Halak from the Washington Capitals for a fourth-round pick in 2014.
A pick that would eventually land in the hands of the New York Rangers who selected goalie Igor Shestyorkin.
Across four seasons with the Islanders, Halak accumulated an 88-65-19 record with an average 0.913SV% and 2.69GAA. In those four seasons, he gave the Islanders some solid starting goaltending for the first time in a long time.
In 2014-15 he accumulated a team record 38 wins in a regular-season and averaged a 0.914SV% and 2.43GAA.
Sure, he had his all-but-fair issues with GM Garth Snow‘s three-headed goalie monster setup with himself, Thomas Greiss, and Jean-Sebastien Berube. He also had his issues staying at the top of his game. Earning a send down to the AHL in the 2016-17 season.
But he was still a great player when on his game.
Honorable mention: Felix Potvin (?)
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Potvin is really the only one that even counts as a goalie that was acquired by trade (who actually played in the NHL). But his 3.35GAA and 0.893SV% between 1998 and 2000 were dreadful stats for the “Cat”.
Was there a better goalie that the New York Islanders acquired via trade that I missed?