Further Adventures with Trivia

Last week's visit by the Dodgers has conspired with the previous post to create treacly feelings within regarding the career of Don Sutton. For those of you too young to remember Sutton was Tom Delay to Steve Garvey's Mitt Romney.
Sutton's career was not without significance. However, with regards towards Righties who started for the Dodgers, he only straddles the great divide that separates the likes of Drysdale and Hershiser from Ramon Martinez.
What is astonishing is how Sutton fit in within the parameters of success within his era. The Trivia Answer reveals that Sutton was remarkable for his durability - indeed, nos. 2 through 8 on the list are all occupied by pitchers from the late '60s through the 1970s.
What was it about the strengh of these pitcher's bodies that enabled such longetivity? Or, does responsibility for this statistical revelation lie within the minds of the managerial class?

Ethan