Acting rank can be a funny thing.
I came out high on a promotion list, and was slated for an acting rank appointment ... but for that you
have to meet the Job Spec. So I didn't get the job. Two years later, I got substantive promotion ... and guess which appointment I got!
The guy I replaced had held the job in acting rank for 2 years (as he had met the job spec). We were both promoted substantive on the same list