Cochran was a top-notch trial lawyer, but that win took the combination of that, the rest of the so-called "Dream Team," the utter incompetence of Marcia Clark and Christopher Darden, a star-struck Judge Ito who let the defense team get away with murder (figuratively and literally), a star witness who brazenly committed perjury and said nigger as every other word out of his mouth, and that absolute dipshit Vannatter, plus a ludicrously incompetent chain of custody for critical evidence.
But yes, it wasn't Cochran alone who did that. He (and the others) just seized a golden opportunity to get a murderer off, which was their job.