Saw a great breakdown of this play on NFLN the other day and it actually proves my point.
Cobb is the primary target. Cook is supposed to run right at and then under the safety, drawing him up and to the left and away from Cobb. Cook gets jammed at the LOS throwing the timing off. Notice how hard Cook tries to get off the jam and get to the safety.
AR sees Cook get jammed up and looks to his check down but he stays calm in the pocket and eventually Cook does his job and Cobb opens up just as the play is designed.
The postgame show I was watching actually used this play breakdown to show the difference in AR's play in the second half. Calmed down. He didn't bail out when Cook got jammed. He stayed with the play's design and executed it.