I am hard-pressed to believe that a substance like HGH, which primarily helps with recovery time & not as much with muscle growth, wouldn't have a massive impact on pitcher stamina & therefore maintaining success deeper into games & seasons. A starting pitcher's job, to a large extent, is recovery from fatigue. They haven't really been testing for HGH until recently so I'm not really sure we can track it's impact quite yet. Steroids testing, on the other hand, has been around long enough to see a trend. If pitching is helped more by the things we don't test for than the things we do test for then it stands to reason scoring would be down. Once we get HGH testing for a few years I wouldn't be at all surprised to see the trend reverse somewhat. Not all the way back but to somewhere in the middle. And one final thought is that I think it's setting oneself up for frustration and/or disappointment to view the past season or two as when 'PEDs are no longer being used. I do not believe all the players are clean. I never thought the program's success should have been judged by that strict of a measure. I do believe it reduced the number of cheaters and is moving forward at reducing it even further. Especially that they now test for HGH and that also makes finding synthetic testosterone easier. I think it also helps players now know if their contacts get some heat and turn on them they are screwed even if they don't test positive.