Mark Belanger, the guy before Cal at SS.
Belanger was a defensive wizard who was completely futile with the bat. In his day, it wasn't unusual to completely punt offense from the SS position. He hit 20 HR's in 18 seasons. He routinely hit below .200 in full seasons. His career high in doubles was 22, the only time he exceeded 20. In 1970, he had 12 extra base hits in over 500 PA's, and his OPS+ was 56.
But teams weren't asking shortstops to hit. They asked them to bat 8th, maybe bunt a guy over now & then (Belanger was a good bunter who led the league in sacrifices a few times), choke up, and give the pitcher a tough AB (Belanger could draw a walk, which kept his career OBA at a respectable for the era .300).
To show just how little shortstops hit in his era, Belanger's career year with the bat was 1976, when he managed to OPS .661, which was good for exactly league average (the only time in his career he wasn't below 100 OPS+). Those 170 total bases equated to 3.5 oWAR. Combined with his stellar defense, his total WAR for the season totaled 6.2. For a comparison point, Barry Larkin exceeded 6.2 WAR twice in his 19 year career. Derek Jeter three times.
Belanger's career WAR was 37.6, with literally less than zero contribution offensively (39.3 dWAR, 68 career OPS+). No matter what defensive stats or metrics you prefer, UZR, total zone runs, dWAR, assists, range factor, whatever, he checks out, routinely leading the league in everything. His fielding percentage was 13% higher than the rest of baseball during his career, so he not only got to more balls than anybody else, he never made errors either, cracking the top ten in errors only once in 18 seasons.
Belanger is a forgotten guy, but he's probably one of the best defensive players to ever play the game. The game has changed, and guys with his skill set don't get out of the minors anymore. Not saying that's good or bad, it just is.
And keep in mind, he played next to Brooks Robinson for a good chunk of his career.