Delusions of grandeur and the Nancy Rothwell paradox

While Nancy Rothwell was vice-chancellor, the University of Manchester climbed steadily up the Shanghai global rankings to 35. But there was widespread student discontent with Nancy Rothwell. Now the university languishes at 52. That gives rise to a paradox, which starts with these propositions. (A) The students are right to oppose Nancy Rothwell. (B) The university did much better in the global rankings when Rothwell was manager. (C) The best explanation for its earlier success is that Rothwell was a great manager.