In fairness to Boykin, he played well on special teams. That play where he beat the punter to the ball was pretty awesome.
I think Adams is probably a craftier route-runner, and certainly a better athlete. I don't think Boykin could consistently get separation. Plus all the youngun' WRs were bound to eat into his snaps. Who knows, maybe he was hiding an injury. Or just playing with bad pad level.

Adams will have to really improve to see the ball thrown his way, with Jordy and Cobb ahead of him on the depth chart.