His final season was the only year (other than his short rookie season) that he didn't thrown 200 or more innings, when he finished with "just" 198 2/3.
Here's Seth's article projecting the corner infielders for the organization this season. http://twinsdaily.com/topic/24883-article-2017-minnesota-twins-roster-projections-the-corner-infielders/
Are you inferring that Bill James believes that pitchers are less important to pitching than the fielders behind them? If not, you may need to expand upon what you're saying, with some James references.
Speaking of data, how about his abysmal marks in the majors at shortstop? A small sampling for sure, but it is a data point, and it is a serious reg flag.
Given the differences between ball-in-play types and frequencies of pitching staffs, range factor is every bit as lousy (if not more) in small samples.