Risa

presumably zimmerman better understood the dangers implied in flippant worded commands. kindred spirit, living by "if ignorance is bliss, give me agony."
contrast to geordie whose chipper demeanour carries him further without learning such lessons, less e.g. bitterness reflected back to teach him he needs be careful, or his creations could cost many lives. and besides, the rest of the crew and all the safety's are around and ready to pick up the slack. zimmerman, no such supports. he programs with holyC.