[yobbo]

Hypothetically, anything can happen.

A "senior" cosplaying as junior can easily turn into conflict and deadlock when people feel their toes being stepped on by someone beneath them.

A junior cosplaying as senior reflects a situation with nepotism or favouritism. They are typically routed-around, quietly, by the people with relevant competence and jobs to do.

Real believable seniority is actually important in eliminating friction.