I agree with you on points 1 & 2 - in my head, they choose Cam because they want someone with military experience, because of the replicators and the wraith and everything. Plus, they think that Cam will be a calming influence on John,poor misguided souls. He's second choice after Sam though - something super-amazing and scientific happens on Earth to keep her there, probably something Ori-related.
3. A little of a, a little of b, a lot of an unspecified c (sorry, this is where I get annoyingly secretive because I don't want to spoil the surprise of that bit).
4,5,6. Your way sounds a lot like mine - sort of seeing where the story takes you rather than knowing at the beginning. Talking out the dialog with a tennis ball wuld, yeah, get you some odd looks, I guess :) I walk up a hill for 15 minutes to get to uni every day, and I have horribly bad knees, so it hurts - I distract myself with a scene running in my head. Of course, then I end up scrabbling for paper when I get to class and scribbling frantically so I don't forget it.
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3. A little of a, a little of b, a lot of an unspecified c (sorry, this is where I get annoyingly secretive because I don't want to spoil the surprise of that bit).
4,5,6. Your way sounds a lot like mine - sort of seeing where the story takes you rather than knowing at the beginning. Talking out the dialog with a tennis ball wuld, yeah, get you some odd looks, I guess :) I walk up a hill for 15 minutes to get to uni every day, and I have horribly bad knees, so it hurts - I distract myself with a scene running in my head. Of course, then I end up scrabbling for paper when I get to class and scribbling frantically so I don't forget it.