Not to turn this into a sideshow but first sign of Nelson's emergence was in his thirrd year, at the end of 2010, in that late December game against NYG and then the huge game against Pittsburgh in the SB. In his fourth year he went over 1200 yards receiving. I agree with your main point, which is that there have been ample opportunities for Janis to earn playing time whereas Nelson had to split time for his first three years. Moreover, the comparison really isn't apt because Nelson was much more polished coming in and he got plenty of playing of time from the get go. Janis was much greener and has never really dispelled his initial limitations.