[throw2016]

This doesn't hold. If A is 'greatly outperforming' then a bonus or incentive can be linked to the greater performance leading to a higher pay.

Without measurements how can we can say who is delusional, A or B? Ultimately transparency benefits everyone except those who currently non transparently draw greater wages without justification.

People will adopt their attitudes, there is no place for immaturity and ego in a professional context.