The dropship/control ship was the "brains" of the mothership. It couldn't break orbit without the control ship or whatever they called it. The control ship needed the fuel to get to the mothership, but from there the mothership had all it needed. The aliens were like a hive. They show the inside of that ship and they're all like scattered confused insects. The mothersship was probably completely automated for all we know and Chris was the only smart one around to keep it all together - or maybe there were more smart ones at first, who knows.. That's all part of what makes this movie great!
And as far as a sequel, I never really expected one. At least not one with them returning for revenge. A) It will probably take them 100+ years to reach their destination and B) Revenge just doesn't seem like a priority to them.
Something about what happens to Wikus would be nice though. If he gets cured or dies or lives in hiding for the rest of his life. He is the last prawn on earth so I would imagine someone would snag him up eventually and disect him.
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