2-1B's appearance at the Anakin/Vader rebuild/revealing seems like George had ILM pull out the most affordable and available droid they had on hand without again thinking it through design/story-wise. I think IG-88 and the Death Star Droid would have been a more interesting choice. As for neither having medical experience, 2-1B's isn't needed all that much as Anakin is "more machine now than man" so a mechanically apt one would be more appropriate than a medical one, although I realize various vitals would have to have been monitored but even those are secondary because the point it he was being transformed into a robot-like thing.
So uis 2-1B like C-3P0 and R2-D2 in that he is witness to both events in the PT and OT? How did he make it out of the Vader rebuild room on Coruscant or is he another in a series, supposedly two, like the many 3P0 variants seen onscreen in the PT/OT?
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