The NFL draft advisory board will give a player one of three grades: first round, second round or neither. Thats it. Now, it is up to the player to request a grade from the advisory board, and whether or not to listen to them, but I don't see Dortch getting a first or second round grade. Most of the smaller WRs people have mentioned had several years more productive than Dortch, with Tyreek Hill being a clear exception. Trindon Holliday may be a closer comparison, and even his return numbers were much greater. Ryan Switzer played 4 years and only in his senior year did his receiving number's match Dortch's receiving, but did have several more punt return TDs.
The injury thing could be the big decider. Just seems like a big gamble to declare so early, maybe he is a 6th or 7th round option right now, and could that change next year, it will depend.