out of the group initially sampled in the OP, Keon was the second-youngest at draft day...Kenny Britt was a few months younger.
Here are Kenny's 9-year career stats, not eye-popping. I assume Keon will take a step this year and be closer to 800 yards than to 500 (barring any injury obvs)
Games Played: 116
Games Started: 75
Receptions: 329
Receiving Yards: 5,137
Yards Per Reception (Average): 15.6
Receiving Touchdowns: 32
Longest Reception: 80 yards