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Keith Hernandez is probably the last player worth mentioning from the list of top position players, as both lists drop off after him to solid but unspectacular players like Howard Johnson and Bud Harrelson. Hernandez is in the mold of Piazza, Carter and Beltran as a Hall- or borderline Hall-of-Fame member who spent an extended time with the Mets later in their careers.
From 1983 to 1989, he was worth 25.0 bWAR and 27 fWAR. He’s more memorable than most players, and he’s good enough that he may eventually get a Hall push from the Veterans Committee. However, I would need to see movement in that direction (like taking his number out of circulation) to rate his chances higher than “generally unlikely.”
On the pitcher list, Dwight Gooden is second behind Tom Seaver. Eleven of his 16 seasons came as a Met, which represents 39.3 of his 45.1 bWAR (and, in case you were wondering, 52.9 of his 58.1 career fWAR). Like Strawberry, his relatively disappointing later career (and the accompanying legal problems) took some of the luster off his early peaks.
He’ll need some sort of help from outside circumstances to lead up to a retired number.
Jerry Koosman is like the Edgardo Alfonzo of the pitcher list. He was solid-to-above-average (although for a much longer time), but he’s been relatively forgotten. His 37.0 bWAR puts him third among pitchers in team history (and his 44.8 fWAR is pretty impressive, too), but I don’t foresee a retired number for him with the number of players ahead of him and his relative obscurity.
The pitching list drops off significantly to fourth place (Al Leiter at 26.4), so now is probably time to move on to the current roster.
Johan Santana has had the best career of the rest so far, with 48.6 bWAR and 47.4 fWAR. His Mets term (2008 to 2012) has only provided 14.6 bWAR and 12 fWAR. If he can get healthy and run off a few more strong years in a row, he might work his way higher on the list.
That would also move him into the Hall discussion, which would boost his chances at a retired number with the Mets even further. So right now, it's entirely dependent on his future health.
Ruben Tejada and Matt Harvey may some day rank among David Wright as faces of the franchise. At 22 and 23, respectively, they’ve been impressive in their limited times and have enough potential to go far. We’ll just need to wait and see.
R.A. Dickey is having a break-out season, but he is also 37, and he’s only been a Met for three seasons. He’s a nice story, but it’s difficult to assign any certainty to his candidacy.
I originally forgot to bring up Franco, as closers frequently don't match up in WAR. However, it is worth noting that he served as the third (and currently, most recent) captain of the Mets, after Hernandez and Carter. He also has a huge save total, which will help keep him in memory. It's worth noting that he originally wore number 31, but gave it up for number 45 when Mike Piazza arrived.