Since there no response ill tell you exactly what happened.
Teams knew he was sitting back on routes because he does have great speed running in a line. So they as they saw him sitting back, they started getting him on hook routes that left him flat footed. After a few of these they started getting him on them seam and 9routes because that hook route was in his head.
Teams knew he doesnt have the ball skills to jump routes. So they used that against him on routes they knew were easy to get on him. He never adjusted because he just couldnt. Can he work on that this offseason, yes but it remains to be seen if he can put that into the game.