Well, no, they couldn't, that's the whole point of this. Under Chevron doctrine, the courts were deferring to the agency's own interpretation of the law they w

Well, no, they couldn't, that's the whole point of this. Under Chevron doctrine, the courts were deferring to the agency's own interpretation of the law they were testing that agency's actions against, and not applying their own "reasonable" interpretation of the law at all. Reversing Chevron restores the court's responsibility to engage in that interpretation on their own part.