And ugh, that's only of my least favorite things to come from the Almanac/AVP. But I've gone into a whole thing about that elsewhere already so no need to clutter the thread with it again.
Prime Nova to Nova Prime is indeed one of those elegantly simple things, but I always liked the original syntax for being more, uh, (prime) novel. Aside from showing that not everything was parsed as Something Prime, it has a non-English flair to it.
I like how "Prime Nova" could work and show the evolving nature of Cyberyronian society. Like how the Roman Emperors were at various points called "Caesar," "Augustus," "Imperator," and "Emperor." It makes sense that over Cybertron's long history the exact title of the Matrix holder would change and that maybe "[BLANK] Prime" is a relatively modern way of saying it?
At the same time... I rather like how Nova Prime sounds too, and Nova Prime has had a couple appearances across a few continuities and has had some fairly significant lore to him (he even got a turn being the Thirteenth in Earth Wars) whereas "Prime Nova" is just a namedrop they never did anything with.
My headcanon is that he was called "Prime
Nova" during his era but everyone calls him
"Nova Prime" presently, like how we call Augustus the first Emperor of Rome even though he never had that exact title.
Well, there it was that popular fan theory that Dion became Ultra Magnus.
I seem to remember around the late 2000s or early 2010s, when Hasbro was doing Q&As with the big fan sites, they gave a definitive answer to Dion, saying he died and never got rebuilt into anyone.
Then they told FunPub to go with that with their Dion comic, but FunPub didn't think they'd sell as many Dion toys if he just unambiguously died, so they left it vague enough that he could be seen as becoming Ultra Magnus, all against Hasbro's wishes.
ANYHOW
My headcanon is that Delta Pax, Ultra Pax, and Orion Pax were triplets born from the same spark hotspot.
Ultra and Delta joined the Autobot military and both achieved the rank of "Magnus," compete with the upgrades that entails.
Orion was seen as the slacker of the brothers, seemingly content with a rather low level job. Of course the War starts, Sentinel gets yeet'd, and the Matrix chooses Orion, who becomes Optimus Prime.