why exactly did the flyers let him go?
The Flyers drafted him in 2008 but decided not to sign him by to an ELC by June 1, 2011 and they lost his rights as he became a free agent.
We all know how good the Flyers are at judging goaltender talent - almost "Burkie Bad", eh?
In the 2011-12 season he put up phenomenal numbers in the SEL. Eriksson experienced a breakthrough season as the established starter for Skelleftea of the SEL. In 33 games, he posted a stingy 1.73 goals-against average and a gaudy .935 save percentage. In 19 postseason games for that club, Eriksson turned in a 2.20 goals-against average and a .918 save percentage in a run to the SEL championship series where Skelleftea lost to Brynas IF in six games.
Ericksson shared the goaltending duties with veteran Markus Svensson during the regular 2012-13 season. He was 21-9 in 30 games with 5 shutouts and had a 1.70 goals against and .930 save percentage. Skelleftea had the league's best record and won 12 of 13 playoff games to capture the Swedish championship. Eriksson was 10-0 in the playoffs with 3 shutouts and had a 1.06 goals against and .952 save percentage.
And then Vancouver signed him.