Because that mirroring, and duality, is already expressed in Amy's story due to the positive/negative aspect of her Schroedinger's pregnancy. Two kids is difficult enough to juggle when you have the thematic justification of OMGSPARALLELS but I'm not sure how this puzzle piece fits in. I'm wondering if the key here is that, strictly speaking, the Amy/Rory and Doctor/River storylines are not running in exact parallel, but that Amy/Rory are leading and serving as an example for the Doctor. So, in season five, the main storyline was fixing Amy's problems, her growing up, and marrying Rory. The idea of the Doctor marrying River is planted, but not resolved. But by the end of the season we see that the Doctor is watching Amy and Rory and thinking that he may want the same himself. This season, then, I'm guessing Amy's story becomes the Doctor's: we will be fixing some of the Doctor's big problems (Time Lord Victorious stuff), helping him grow up, and he'll actually marry River. In the meantime, Amy and Rory have moved on to a storyline about being parents. I could see the pregnancy story of season six really only being about Amy, but with hints and parallels dropped suggesting that this is in the Doctor's future. And then season seven might be the one that's actually about the Time Baby and the Doctor and River as parents? Moff did end The Eleventh Hour with a big, neon-lit hint about the Silence, and by the end of the season we still hadn't really addressed it and it's become the main story of this season instead, so I could see him doing the same with the Time Baby--his stories tend to have that sort of symmetry and structural neatness to them.
But I do find myself asking if it's so horribly implausible, if that child is theirs, that River was forced to give her to the Silence - and then forget all about it - because it was better than some kind of alternative.) *shudder* That would be dark, dark, dark. But not entirely implausible, I think? I mean, whatever the explanation, we've already got a story going on in which either aliens have built/made a child or stolen one away from its parents and she's wandering the streets dying. We're already in very dark territory.
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I'm wondering if the key here is that, strictly speaking, the Amy/Rory and Doctor/River storylines are not running in exact parallel, but that Amy/Rory are leading and serving as an example for the Doctor. So, in season five, the main storyline was fixing Amy's problems, her growing up, and marrying Rory. The idea of the Doctor marrying River is planted, but not resolved. But by the end of the season we see that the Doctor is watching Amy and Rory and thinking that he may want the same himself. This season, then, I'm guessing Amy's story becomes the Doctor's: we will be fixing some of the Doctor's big problems (Time Lord Victorious stuff), helping him grow up, and he'll actually marry River. In the meantime, Amy and Rory have moved on to a storyline about being parents. I could see the pregnancy story of season six really only being about Amy, but with hints and parallels dropped suggesting that this is in the Doctor's future. And then season seven might be the one that's actually about the Time Baby and the Doctor and River as parents? Moff did end The Eleventh Hour with a big, neon-lit hint about the Silence, and by the end of the season we still hadn't really addressed it and it's become the main story of this season instead, so I could see him doing the same with the Time Baby--his stories tend to have that sort of symmetry and structural neatness to them.
But I do find myself asking if it's so horribly implausible, if that child is theirs, that River was forced to give her to the Silence - and then forget all about it - because it was better than some kind of alternative.)
*shudder* That would be dark, dark, dark. But not entirely implausible, I think? I mean, whatever the explanation, we've already got a story going on in which either aliens have built/made a child or stolen one away from its parents and she's wandering the streets dying. We're already in very dark territory.