Does your hypothetical company have as much turnover as an NFL roster? Do employees get injured at the same rate, unable to perform for most of the year, or perhaps, ending their career prematurely?
And does the hiring of that single employee directly and immediately affect your ability to train and develop internal candidates for the position? Are you allowed to hire from this pool of candidates only once a year?
Is the prospective employee 1/53 of your workforce? If the single employee's position historically had a 50% turnover rate, doesn't it make sense to audition two players for just about the price of one?