The better or "elite" units formed always only a small part of Celtic or Germanic armies. There is no reason to presume that levies were better trained in the early times and later not so. They would not have had become obsolete only because a little bit more better troops became available. So I think the mechanism of EB (and EB II?) that later on more better troops become trainable is enough. The levies so become relatively worse, not absolutely.
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