if Reitsma were here, Reith wouldn't be, plus Wagner's innings probably would have decreased
Not necessarily. Jones is the one who wouldn't be here. There wouldn't have been any reason to pick him up with Reitsma, Riedling, and Graves all in place.
Wagner's pitched only 14.2 innings, which is about half as many as Riedling and Jones each and five less than Reith. Even if Reitsma had stayed, and pitched the same 25-30 innings that Jones has gotten, I don't think Wagner's innings would have decreased any.