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9 has a zipper on his body to fasten his skin which was open when he was created but was closed later in the film. Unlike the others, the Scientist didn't remark anything about 9 because of the Scientist's death.
9 even attempting to sacrifice his life, so 7 could retrieve the Talisman from the Machine and save the souls: along with 7 and the twins 3 and 4 , he is a survivor.