15. Jorge De La Rosa (Rockies Career WAR 15.0)
The almost literal opposite of the last player on this list. Jorge is the winningest pitcher in Rockies history with 86 despite a career ERA of 4.35.
The filthy lefty is also the 2nd-longest tenured Rockies pitcher behind only the next player on this list. This should help illustrate how hard it was to separate these players as we get closer to the end of this list.
Jorge, or De La as I liked to call him, was a personal favorite as he was a prototype bulldog lefty that seemed to win simply by sheer will when he was on the mound. He was a player that I believe lead to the belief and signing of other pitchers with big natural movement that thrived at Coors Field by the natural effects that the park had helping him reign them in.
His best year came in 2013 as well when he flipped it from the left-side to the tune of a 3.49 ERA, 112 K’s, and 16 W’s in 167.2 IP for a 128 ERA+ and 4.4 WAR(which was a career-high).