This is all sickening really and all pointless really. If the company end up overpaying Person A (which they'll learn by hiring Person B,C,D and seeing their p

This is all sickening really and all pointless really. If the company end up overpaying Person A (which they'll learn by hiring Person B,C,D and seeing their performance), they will let Person A go. If the company end up underpaying Person A, which will be obvious from levels.fyi, glassdoor and colleagues, Person A will just not do a good job and leave.