the easy answer is NO... looking at his career that season really was the outlier...
he is also 42 years old... age is the number one predictor for injury...
BUT knuckle ball pitchers can pitch forever, and the pitch is so unpredictable that he could return to being a stud ANY season as long as he stays healthy...
So no, i would not bet on it, nor draft him... BUT won't be totally shocked if he is fantasy relevant this season...
I looked at his game log from last year and his problems have really been in the AL East. He has struggled against TB, NYY, Bos in that division. Outside of those teams, he's done okay. I won't pay up for him though.