Bronze Lorica Segmentata

[Tarbicus]

I just meant that ty same system of plates as was used for backplates could be used also for chest plates.

In that case, where did the two larger plates that everyone believes to be chest plates go?

it still seems unlogical that one sculptor would create two different types of armour on one freeze, if we clearly know one of these types really existed.

None of the Trajan Column types of seg have been found, just like the archetypal officer attic helmets, as seen on your photo of the Marcus Aurelius Column. Both columns are in Rome which means the sculptors had probably never even seen actual segmentata on an actual legionary.

Of course details like narrow shoulder plates or also small sized shields are just artistic point of view, but it has its historical base.

Or the sculptors just followed an established formula. The friezes were for the citizenry, not the military, so it's highly unlikely that they were ever intended to be in ay way accurate, so long as a citizen would realize the difference between legionaries and auxilia.

And as Morel, one art historian notes, sculptors of this monuments were soldiers (from legions),

The sculptural style is typical of provincial artesans. It's discussed in a paper, which I can't remember the title or author of.