4th and 4 and you call long pass to Wilson ???

He already made that decision based on the defensive alignment. He knew he was going to Wilson if he felt Johnson was covered.
He didn't wait to see if JJ could separate from the DB , which he did. Go look at the play again. DC had PLENTY of time, at first the LB was in the way but JJ cleared him and had a step on the DB. DC got impatient and threw a LOW % pass