Why do you believe the Steelers passing game is designed around DJ? I don't think it is designed correctly at all, period.
And trying to say that DJ isn't performing while other players are is just false. Pickens while he show flashes is very raw and makes mistakes all the time, how many times has he stepped out of bounds and then come in to catch the ball? I would not be happy with him as the only receiver of note for Kenny next season. With all his "greatness" he has 3 TDs this year.
And Muth, while I do think he is having a good season, he has 2 TDs.
This isn't a case of Pickens and Muth having 8TDs and DJ having zero. This is a case of an ineffective OC that doesn't know how to call plays and scheme, especially in the red zone combined with a rookie QB that doesn't know how to throw people open especially in the red zone.
Now don't get me wrong. I do not believe DJ is a true #1 receiver. But he can be a good #2, especially if you know, they threw a slant every once in awhile. Does a slant even exist in Canada's playbook?