BR means Baseball Reference and FG means Fangraphs. I don't know why they are so different on WAR. I also don't know if FIP, xFIP, Sierra and tERA are park adjusted. It looks like BR gives Sale about a 105 for pitching in U.S. Cellular Field and Strasburg does not seem to get adjusted much, so his park must be neutral. So for the league %'s on FIP, xFIP, Sierra and tERA, we could multiply what Sale has by about .95. He would still be higher than Strasburg, but a little closer.