Late Roman Army - seniores and iuniores

[Robert Vermaat]

OK, so now you see the first detachment as the seniores and the second detachment as the inuiores? That's different from the first theory but I can go along with that. But how about a third detachment? Another iuniores? Assuming, as I gather is your Original premesis, that the army needed to make the distinction between parent unit and each detachment. But then we might have two iuniores units of the same name, which would be impractical, plus we never come across this.
The 'Gallicani' solution does not work I think, because thiat runs counter to the original sen/iun naming - why not use such a name to begin with, and combine the stations of the detachments with their (original) unit name? So instead of LegioVIIGemina/Septimani seniores/Septimani iuniores you'd get (hypothetical) LegioVIIGemina/DivitensesSeptima(ni)/Solenses Septima(ni).

For now I rather stick to the notion that the Roman army was not an organisation that stuck to disctinct names - i.e. names varied throughout the sources. we see similar 'sloppiness' when it came to mentioning correct ranks and grades. Meaning; we can't trust the military sources to give us 100% correct details and allowing us to draw conclusions from them.