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It's a theory, really. With the Kumi (and Kasumi) situation, the last we see of Kumi is the final panel with the picture of her restored, then on the "chibi comic" which again fails to disclose anything. We don't know whether or not Kumi and Kasumi regained their powers after all that. Megumi we know can not, but the other two were left up in the air.
This may go for Yuri as well, considering the spiral in her hair. We know her borg is defective, but what does this mean? During the sunflower incident, did she and her borg begin to fuse, but were cut off halfway? I think this may be one of the reasons Hitoshi Tomizawa ended the manga with so many mysteries. He himself has said A9 is aimed at young adults, who are (mostly) able to question and think about these things better than a small child would.
thank you
and to answer your question about Yuri's spiral in her hair...
I think when Yuri's borg was standing over her and dripped its saliva into her mouth while she was sleeping, then she was startled and woke up.. I think that's the time when Yuri began to get the drill in her hair, cause her borg tried to fuse, but Kumi and Kasumi stopped that from happening.