Trying this out to marry the 'good starting pitching' and 'well rested bullpen' ideas (which were kinda the same thing anyways). By month, team rankings in starting pitching innings and reliever fWAR
April: 25th, 25th
May: 9th, 8th
June: 10th, 28th
July: 5th, 2nd
August: 18th, 5th
September: 6th, 30th
I realized halfway through this (dumb) experiment that I was trying to find correlation between two stats that should trend in opposite directions because they're both cumulative and pulling from the same finite amount of innings. But even still, I think when people think about the bullpen being bad they think about early season struggles and the correlation is pretty good there.