We forget about vital thing about Musubi. She was brainwashed, as stated in NOiSE. There is a strong connection between Sanakan and Musubi, purely because of her physical appearance. She may have also changed her weapon, from a GBE sword to the GBE gun, since it is more efficient. This would also explain -WHY- Sanakan had a bit of a "human touch" during the later parts of Blame!, where she was going after Level9.
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