You should treat a salesperson’s inteview very differently from an accountant’s interview.
In a lot of ways, a job interview is like meeting your future in-laws.
In order to “be fair” the advice from this article would be given to each candidate.
To really test a person’s ability to read a situation, you’d never give them this info. But if a job requires less interpersonal skills than selling to CEO’s, you might want to give the poor candidates a leg up to start. HR can prep the candidates, then you can see how well they follow instructions. That is another great thing to learn.