ERA is subject to errors. The Twins were butchers in the field last year, yet they only committed 70 errors, ranked 28 third fewest errors in the league, while also ranked dead last in UZR 150. They had so few errors because they all just stood out there like statues.
meanwhile Ryan ranked 8th in WHIP and 32 in WAR, Ober 9th in WHIP and 37th in WAR, and Lopez 47th in WHIP 29 in WAR. It’s good to limit base runners and throw a lot of innings, isn’t it?