Yet even without the kind of interaction Seven had, Hugh caught on very quickly to emotions. They seemed to come right out of him in a matter of days. In comparison, Seven's emotional development seemed stunted; she was more like the Doctor, Data, or Spock. Hugh, on the other hand, while he had a lot to learn, seemed to be a very quick study when it came to emotions, having the absorbing capacity of a child. (And I mean that in a good sense, in that children tend to be very quick learners.)
I don't see how after clearly establishing how strong Hugh's emotions were, and how quickly he began to express them (including with some very typical "humanoid teenager" errors), how Seven could be so stunted. Hugh showed no evidence of memories of a "past life" yet learned that. Seven had memories of humanity and all of what you would think would be advantages, that you described above, yet did not.