I don’t think that in that case the tentacles made Doc Ock a reverse centaur necessarily, but I see the similarities. The tentacles weren’t doing the thinking, and IIRC the neural link increased Otto’s rage and aggression, and suppressed his emotions and compassion (plus his wife died so he had little to care about). Maybe there needs to be a third term where using the machine as a centaur changes the behavior and brain of the operator?