I think Bakhtin [intentionally, for his own purposes] misreads Saussure when he says: “Therefore, the single utterance, with all its individuality and creativity, can in no way be regarded as a completely free combination of forms of language, as is supposed, for example, by Saussure (and by many other linguists after him), who juxtaposed the utterance (la parole), as a purely individual act, to the system of language as a phenomenon that is purely social and mandatory for the individual.” (Bakhtin, 1986, 81; cursive is author’s).
Bakhtin, Mikhail. (1986) “The Problem of Speech Genres.” In Speech Genres and Other Late Essays. Austin: University of Texas Press. 60-102.