Late Roman Army Grade/Rank List under Anastasius

[Nathan Ross]

We have many implication that units were transferred via the "gate" of the institution "pseudo-comitatenses"... Cod. Theod. VII 1, 18

I'm not sure - the law you quote refers specifically to individual soldiers (singulos milites) being transferred, not entire units; the implication is that corrupt comites and duces were using this promotion as a reward or favour (?). This isn't to say it didn't happen - the existence of the 'pseudo-comitatenses' at least suggests it did, somehow. But there's no evidence for it here, I think.

a good proportion of pseudo comitatenses in the ND looking a bit auxilarian.

True. Although they could have come from the 'old style auxiliary' cohortes still based on the frontiers, rather than being 'remodelled' as new-style auxilia, perhaps?

the permanent high rate of cavalry with its own standards

Ah! So you're suggesting that the vexillarii were cavalry standard bearers? That would make sense, although it still leaves us short of cavalry commanders. But there are only 10 of them, and the number of veredarii (if they are indeed cavalry) does not divide equally between them...

Even units which had a - let's say a proper name before - were simply renamed after the place where they were garissoned now.

Perhaps a process that began in the 4th century? We have in the ND the palatine legions of the Divitenses (from Divitia) and Tungrecani (from Tungris/Civitas Tungrorum?), among several others with 'place name' titles. Plus all the 'milites' of various locations under the command of the frontier duces.

With the slabs of Perge we have no template, which is applicable to all or many other units... Therefore we cannot compare the time of 400 with that of 500 regarding this topic.

That's a shame, if so!

It does seem possible to arrange the numbers given on Slab C into something approximating a regular legion organisation, based on 20 'centuries'. We could even trace this back, perhaps, to the reorganisation of the 'new legion' of the tetrarchic or Constantinian era. But I concede that this might be wishful thinking!