Not claiming to know anything special, but if that really is the only perturbed variable, it most likely hinged on that. Or familial ties that are somehow inscrutable. All conjecture, but I find these single cases to be ridiculous, because there are competent individuals in government who oft do what they're supposed to, even if the whole government mechanism appears corrupt and broken. Most likely there was a legitimate reason, and of course we only have one side of the story here, by an associate professor and his PhD student.