And my -0.2 R/G estimate comes from the Fiato/Souders matrix for seasons through 2007. I co-created a system that tries to more accurately identify what parts of run scoring were caused by the abilities of each team's defense, starting pitchers and offense, the parks, the home plate umpires and the leagues all at the same time (because doing park factors or league factors or umpire factors separately and adjusting statistical analyses one factor at a time is mathematically bad (because you're using data tainted by context to try to figure out the contextual adjustments at all times). The F/S Matrix is much more stable for park factor calculation. The Safe has been preventing about -0.2 R/G/Side since 2003 when the black hole batter's eye was installed, thus moving it from a deadly pitcher's haven (due to glare) to merely a fair pitcher's park.