Number 4- Ellis Burks (12.0 bWAR, 11.0 fWAR, parts of five seasons as a Rockie)
By overall WAR, Burks would be higher on this list but he got about two-thirds of that in one season and, largely, in left field.
In the other four seasons as a Rockie, he played about two-thirds of his games in center field. In those four seasons, he amassed a 4.1 bWAR/3.8 fWAR, which is why he’s at number four in our rankings.
Number 3- Juan Pierre (4.1 bWAR, 3.7 fWAR, parts of three seasons as a Rockie)
Juan Pierre is best known for his time with the then-named Florida Marlins but he started out his career as a Rockie. He played in part of three seasons (two full) and he hit .308/.356/.371 with an OPS+ of 71. That OPS+ is low due to his lack of power, as he only had 3 home runs in 359 games.
In his first full season as a Rockie (2001), he led the NL in stolen bases with 46 and he was also second in the NL in hits with 202.