The question in part is about defense saving runs. Kansasa City was considered a best defense. Once again, I am not comparing Kansas City to the Twins. The best defense by metrics did not save the most runs by metrics so it is impossible to say if an improved defense will save you runs. What is probable is that Ervin Santana is going to be a better pitcher for 200 innings than Kevin Correia and Sam DeDuno.. In the event he is injured one would hope that Alex Meyer or by pitching history Milone would be better than Yohan Pino and the rest. 2 statistics to compare in relation to the Twins and KC WHIP for the clubs were 1.35 vs 1.31 LOB % 68.9 vs 73.9 Kansas City did a better job of leaving the same number of base runners on base. Twins pitching up the big innings would seem to indicate that could be as much a cause for the disparity. I can't find anywhere where some has correlated any of the team defensive metrics to ERA, They theorize, but no analytic proof.