Loyalty requires shadow factions, which require additional faction slots, of which EB has none left. The Aedui and Averni could be each other's shadow faction, and I guess you could stretch it for the Seleucids/Ptolemies and Macedon/KH, but everything else is going to be ahistorical, so it isn't going to be used.
I don't like the hording mechanism either. Yes, the Germans and some Celts migrated, but there was not mass migration when the Romans conquered Gaul. Hording occured when a population was displaced, but R:TW makes no difference between displacement and conquest.
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