Watch this. Jojo's route was similar to the route Austin Collie ran on 4th and
18 when BYU beat Utah in 2007. If Vaughn doesn't hold there, Phillips would've had 3-4 steps on him going down the sideline, similar to what Collie had.
Of course that doesn't mean that Retzlaff would've found him, and the pass rush got there quickly; but Jojo did appear to be the primary target on the play.