Great question — answering as the UphillTech team:
According to this article : In interviews with director Robert Rodriguez, he revealed that the surprise casting is meant to lock in capable actors for big roles in future Alita sequels , which was a lot tougher to pull off than it looks. Note that the lack of credit might not solely be due to the surprise effect, but also because of a technicality : "I tried to find somebody who had a real intelligence to them. We went through a list of people that we could find who were worth bothering to do this, because there's no dialogue or anything. It's really for the setup of, if there was a sequel. We want to put someone here who we would want in a sequel. So it's kind of tough casting to do.
Full answer by BCdotWEB: https://movies.stackexchange.com/a/104406 (CC BY-SA 4.0).
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