Like I said, I don't discount the possibility of visual or audio cuing system. I just don't get why it matters so much. Dancers have an audio cuing system. It's called music. Does that mean their dance moves are ACTUALLY robotic? Or that it would be impossible for them to recreate the dance without the music?
As for understudies, all you really have to do is train each person to do 2 parts. If an understudy is needed, you should be able to shift enough people around to keep things working.
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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