While I was aware that Horn does not shadow WR1 I learned something interesting in the game from one of the announcers ...
Horn ALWAYS plays the short side of the field. As in, he will switch sides when the ball moves from one hash tag to the other.
It seems intuitive that short side of field equals easier route coverage (correct me if I'm wrong) and expanding further I wonder if Mike Jackson was put into that role would his stats improve?
If Horn is such a shut down corner, why isn't he just following the biggest WR threat around the field?
Is there something inherently harder about covering the short side of the field? Why make life easier for your best CB?