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Unlike Jaegers built by the Pan Pacific Defense Corps., Scrapper runs on "a single neural load" and can be operated by a single pilot. It is much smaller than a "true" Jaeger and capable of rolling into a ball. 
In Pacific Rim, the two-pilot system was designed because no single human could operate and pilot a Jaeger on their own without suffering seizures and immediate death. In Pacific Rim: Uprising, Scrapper can be piloted without a second pilot despite its mass and weight.
↑John Boyega: [...]"The masses of poor huddled on the coasts have decided to start building their own giant machines. If there’s going to be a fight, they’re going to make sure they’re ready for it. That brings him into contact with newcomer Cailee Spaeny’s amateur Jaeger pilot, Amara, who is building one of her own battle-bots."