Where was the Roman Army in AD408?

[Flavivs Aetivs]

And vice versa, perhaps?

Again this is what I argue, as the majority of the population of the Federate "kingdoms" was Roman.

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When Theodosius stole transferred the best units of the Army of the West to the East after the defeat of Magnus Maximus in 388, that may have meant the effective end of the Roman regular army in the West. It would come as no surprise if Stilicho had only limitanei to work with (hence perhaps the promotion of so many limitanei units to pseudo-comitatenses as shown in the Notitia Dignitatum), while relying on non-Roman troops as replacement for his crack units.

Which is absolutely contrary to the primary source evidence, namely the Notitia. The West still had tens of thousands of men available as field forces.