I'm a big fan of innovative thinking, but it was none other than Billy Martin who began three-by-three pitching corps back in the 80s. In regards to your comments.... I had a similar conversation with Tom Kelly on the radio back in the 90s. Randy Johnson was pitching in middle inning relief after coming off of the DL. He had stopped the Twins in their tracks from sealing a victory by coming in and dominating from the end of the 5th into the 8th inning. It occurred to me what a weapon he might be pitching in 40-50 competitive games in higher leverage situations at say, 3-4 innings per outing. I was somewhat surprised to hear TK respond that something like that might be a great idea, but it could never happen because the player agents wouldn't allow it. Statistical analysis can take the game in new and unexpected directions, but the financial paydays that players receive in glamorous traditional roles represent barriers that will have to be broken down. In addition to that, the potential damage done to the game from such heavy micromanaging has to be carefully considered. Meanwhile, MLB is already extremely concerned about the ever-increasing length of games in a world of ever-shrinking attention spans. We're on a slippery slope, and with the frequency of pitcher injuries already a concern and (mixing metaphors), once the dam is burst and MLB agrees to expand rosters to say, 28, and adds three more pitchers, you have the prospect of managers swamped in data-driven analysis and inevitably tempted into assigning pitchers into ever-more specialized roles...