Bullpen roles are extremely overrated. Getting the most innings out of the best pitchers when run prevention is needed is far more important than putting your best relievers in at designated spots in the game. Just because a game is in the ninth inning, doesn't make those three outs the most significant outs in the game. There are many other factors to consider, the most important of those is using your best pitchers in situations to prevent the team from scoring runs most often. Sure, in a 7-0 game, there's less need to prevent runs from scoring, but in a close game, whether it's the 6th inning or the 9th inning, preventing runs from scoring means just as much. Stats like VORP and Win Shares are cumulative, yes. They give less credit to relievers, specifically because relievers participate less than starters. You may not think that's fair, because relievers are just as valuable in their innings as starters are in theirs...and while that may be true, simply pitching 1/3 as much time as a starter is really what is limiting their value, there. SNLVAR and WXRL are two stats calculated separately. They can't really be used interchangeably, as one compares starters to starters to find a replacement level, and the other compares relievers to relievers. Unless you work under the assumption that the average reliever == the average starter (or, even more of a stretch, a replacement-level reliever == a replacement-level starter), it's not a fair comparison. I think it's a more safe assumption that the average starter > the average reliever.