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Interstingly, Corbin is currently 22nd in WAR for ERA qualified NL SP (29th for those with at least 100 IP). Outside of 2013, his ERA is often inflated by a high BABIP. At some point the organization needs to decide if he's a high BABIP pitcher, which would deflate his value, or if he's been extra unlucky and the peripherals are enough to keep trying.
A comparison:
Code:Year K/9IP BB/9IP HR/9IP LD% GB% FB% Soft Med Hard ERA 2013 7.69 2.33 0.82 22.2 46.7 31.1 15.0 51.2 33.8 3.41 2017 8.74 2.73 1.54 20.6 49.2 30.3 17.1 50.0 32.9 4.76
Corbin has been a top 10 SP in the NL since the ASB posting a 2.52 ERA in 57.2 IP (1.3 WAR) besting all DBacks SPs.
In the last month he's been a top 5 SP in the NL.