If he's on the field, absolutely. (See list of WR injuries, it's week 7) I think Josh is more comfortable with good separators though. (Diggs & Beasley). DK is not a separator.
At least when 1 JAG goes down, Bills can replace with another JAG. Haha.
The Chiefs & Packers have the same roster philosophy. Great QBs/coaching can make mediocre WRs good. Unfortunately, the Chiefs/Packers either A) Draft better players overall/fit their system or B) are able to actually coach them up C) JA isnt as great as I think he is