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"When in doubt, wait and see" is always the best rule of thumb in these situations. As has been said, Donna neither fancies nor even particularly looks up to the Doctor, but she does recognise his occasional tendency to be cruel, which would make her a very different type of companion than any we've seen in the new seasons thus far (Adam excepted - did you know an episode of next season of Torchwood is called 'Adam'?). The Doctor has had companions with whom he had a somewhat prickly and difficult relationship before, just not before the show's regeneration.
I actually think IIV has hit on the most obvious storytelling explanation. Martha's exit seemed to me to be written to make us think both "I guess that's what she needs to do" and "don't let her get away, you fooool!" What I'd like to see when she returns is the Doctor being wildly enthusiastic about having her back, and wanting it to last a while, and for Martha to be a lot less keen.
Plus, if you have people thinking of Martha Jones as the better or even "real" companion, all kinds of interesting storytelling possibilities open up. It's one thing to have a companion whose relationship with the Doctor is prickly and difficult - but what if it was stretched past that, to the point where a companion and the Doctor disagreed so much that they parted ways in a more dramatic way - they betrayed him, or got themselves killed? I'm not saying that's going to happen, but it's a possibility once you stop treating a full-time companion as such a beloved character. |
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