The Mauryans can literally have a completely mobile civilisation. A worker elephant, a Kauntika (Bamboo Spearman) and Maurya can gather resources (Spearman), Deposit resources (Elephant) and train units (Maurya). Doesn't this seem OP to anyone else? I think that being able to train units from another mobile unit is a cool idea, but it should be balanced, by having 1.5x build time and resources for units, or something like that.
BUT DON'T REMOVE WORKER ELEPHANTS!
They are too awesome.