PODstail
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That's not true. I checked by reloading the game several times – the army only grew for Shadia (I left her with 2 dwellings, and even then, no one else's army increased).
That's not true. I checked by reloading the game several times and taking multiple screenshots – the number of creatures grew for all heroes without errors, as long as there were at least 4 of the same creature in one slot. If there were 4 of the same creatures in several slots, the total increase would be applied to one of the slots, and not to each of them separately. 2 dwellings did not affect the final result.