Raul Ibanez would have three runs with the Seattle Mariners, and considering he was a 36th Round Pick, the fact that he played nineteen seasons in total is a huge accomplishment.
Dan Wilson would play all but 48 of his Games with the Seattle Mariners, and he is regarded as one of the best defensive Catchers in Mariners history.
John Olerud had previously won a Batting Title and two World Series Rings with the Toronto Blue Jays, and he would also have a productive run with the New York Mets. His renaissance would, however, take place in the city of Seattle.
Mike Moore was the first overall draft pick in 1981, and he would debut with the Seattle Mariners the following season as a regular starter. He was 7-14 as a rookie, 6-8 in his second season, and 7-17 in his third season, all of which would see him ERAs over 4.70. While this isn't good, Moore had good stuff, so the Mariners stuck with him, and in 1985, he would win 17 Games against 10 Losses, and dropped his ERA to 3.46. He finished 10th in Cy Young voting and was sixth in bWAR for Pitchers.