While ERA retrodictors are n't perfect -- they can significantly overrate .
While ERA retrodictors are n't perfect -- they can significantly underrate players by making assumptions -- it does give an idea , at least , into the potential that Iglesias has .
While ERA retrodictors are n't perfect -- they can significantly overrate or underrate players by making assumptions -- it does give an idea , at least , into the potential that Iglesias has .