There's always a lean towards in the incumbent simply because they SHOULD be able to tailor their examples to the position, but often many don't utilise this advantage. But when applying for jobs, don't hesitate to apply for something you want simply because someone has acted in it before. The number of people I've seen who get a job simply because no one else has bothered to apply would surprise you. AND just because you don't get a job doesn't mean the panel won't note your interest in the position or your skills should something else come up.

I tell my team all the time, apply if you want it. If you do nothing, you get nothing.