I'm probably the biggest Keenan Allen fan on this planet. Keenan produced in college with crap QBs. Keenan gets himself wide open with sweet routes and then soft hands. Keenan was also a 3rd round pick, not a 1st rounder.
Biggest reason for that was his horrible 40 time at 4.71. Good thing for him his speed on the football field was better than his timed speed. Jefferson was in the low 4.4s which should keep him in the first round.