I apologize if this thread has been done before. I wanted to make one for myself that I can look back on at the end of the season to see who the more accurate guesses were.   It's pretty self-explanatory, but every year on almost every NFL team, a guy you'd least expect comes out of nowhere to have a good to great season. Who is your favorite candidate to have a breakout year? People's definition of a "dark horse" may vary. Just use your best judgement. A good example would be...