I have said this some time ago...^^
Maybe Preds reproduce with their mouths, that would be a reason why they had such large mandibles.... yeah and the Predalien get this ability...
think of it, what do the alien in Alien? it (tryied) to rape Lambert... maybe in nearly the same way humen would do it...
and remember... aliens were told as "perfect organism", they could survive in all kinds of enviroment and could adapt every kind of situation, if thats true, then its clear why it is so! they could get the reproduce-ability from their hosts to reproduce under/with them... what really dark and scary feeling/idea, or not? but also very cool...
much cooler as known before and much deadlier^^
EDIT: But the i dont understand why they call it a young queen and why they ave it the crown... it could be just an (pred)Alien that try to mreproduce on its own way like in Alien...