I believe it's overall record but not sure.
No, it's not overall record.
BKB expalined it. IN the 3-way tie, since they didn't all play, they look at the record vs. common opponents. Of the teams they all played, they all beat everybody except UCLA vs. Arizona. Based on that, they eliminate UCLA, and then move on to head-to-head for the 2 remaining teams. Since USC beat Oregon, they win the automatic bid.
Pretty stupid procedure.
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