But that's a huge difference. Your just pushing it off like nothing. Look at our rotation at the end of last year. Skubal and crap. The crap could hardly be counted on where as Skubal started the key games, saved the bullpen and gave the team a morale boost. A player at half the WAR isn't gonna do that.
These aren't robot and just saying oh well its 30 fewer runs NBD is downplaying not only the human element of the game, but a good pitchers actual value.