Interesting. In my JO squadron Aircraft DIVO was either pre-QAO or the final also-ran job (i.e., FITREP ranking below NATOPS & QAO).Perhaps. I don't know what every squadron does. From my JO squadron and airwing it didn't seem to be that strange. For me personally, I know that my first job was Aircraft Divo and I was there well under a year when I got it. Not an exception in my airwing, but of course just my own small perspective relative to Naval Aviation as a whole.
I saw one jg as Line DIVO, but he was a prior-enlisted, undesignated-turned-AT, so the front office, I assume, thought he would ace it (didn't work out so well; I think the real mustangs sniffed him out).