Royals release Kyle Davies: Worst pitcher of all time?

The Royals released Kyle Davies today.

Davies has the worst ERA in the history of major league pitchers with more than 100 career decisions - 5.59.

However, he does not have the worst adjusted ERA.  Davies' ERA+ of 77 is 2 points better than Phil Ortega's.

Ortega is 46 - 62 4.43 in 952 innings pitching for the Dodgers, Senators, and Angels.
Davies is 42 - 65 5.59 in 768 innings pitching for the Braves and Royals.

The era in which a pitcher plied his trade makes a big difference.