I think it is a mis-perception that he disappeared for any stretch in the season. His game breakdown shows:

Game 2 - 5 receptions
Game 6 - 6 receptions
Game 8 - 7 receptions
Game 12 - 6 receptions

He had at least one reception in every game 2 through 15. From game 6 through game 12 he had 24 receptions In the 11 games 2 through 12 he had 34 receptions. His quietest period statistically was the last four games of the season.

When you have two wide receivers who catch nearly 200 completions, and an emerging starting running back with another 40, there isn't a lot left for the TEs and 3rd receiver, let alone the 4th receiver like Boykin. Adams had four big games relatively evenly dispersed throughout the season. From a 3rd receiver, that is pretty consistent, especially in view ot the years Nelson and Cobb had.

How many times was AR even looking for Adams? However, having the confidence to go to him on the fake spike said a lot about what AR thinks of Adams in my book.