If there isn't a difference between the young Queen from AVP and the warriors in AVP:R, why doesn't she have the same head? Her head is semi-transparent like the previous ones. If she's molting into a Queen in the absence of one, then her design would be like the rest if there is no caste. Thus, we should be seeing her with a shelled head that has the crest developing. But we don't. That's not just something that's made up. It's an actual visual difference, and a discrepancy if you believe there are no castes.