There is no such thing as a shutdown corner. I think of a shutdown corner as a person who can guard a receiver in man defense and always prevent the catch. To me, there is no one who can prevent Justin Jefferson from catching a pass thrown by Patrick Mahomes 10 out of 10 times. Maybe once, maybe twice, but not all 10 times.
Why do I think this? Only the receiver and the quarterback know where the both the receiver and the ball are going. The corner does not know where the receiver is going or where the ball will be placed. The corner is merely guessing based on film study and in-game patterns.
Example
If the receiver runs a go route (run straight forever), the quarterback can 1) through the ball as far as he can [rainbow] 2) through the ball on a rope [much less arc than #1] 3) throw the ball towards the sideline but still out in front of the receiver 4) through the ball towards the sideline and behind the receiver [back shoulder fade and the list goes on and on. Let’s use #1 mentioned. Now remember, football is a mental sport. It is not smart to just line up and run a go route. A good corner will know that all they need to do is turn their hips and run as fast as they can to stay with the receiver. A good coach will scheme the go route as follows. The receiver will first run a hitch route (run 10 yards, stop and turn around). Remember, the hitch route does not need to be successful. If it is, good, but not necessary. The purpose of the hitch route is to get the corner to believe that the receiver is most likely running a hitch route on any given play.
Later in the game after a few plays or drives, the offense will try the go route. When running the go route the receiver will start off their route as if it were a hitch route. Now, I’m not saying the receiver will run a hitch and go (which would work too). The receiver will maybe stutter at 10 yards as if they were going to turn around or just not fire off the line immediately. Both of these actions will lead the corner to guess the route is anything other than a go route. Once the receiver gets a step on the corner a decent rainbow pass will lead to a completion.