There is so much more than speed and quick cuts to a WR.
First he has to be able to read the defense. Many if not most college kids struggle with it when they get to the NFL.
Then they have to be able to run the correct route and make the proper adjustments in route. (Make the back shoulder catch, make the move off a double pump by the QB, break to the outside if the defender over plays to the inside, settle in the seam if the defense is in a zone.)
They have to be strong enough to fight through the defender's hand grabs, bumps and pulling on the jersey. So many kids need a year or two to build up their upper body strength.
Next they have to be able to do this at NFL game speed. (Many fail to do this in their first couple of years.)
They have to be on the same page with the QB when it comes to audibles whether spoken or just a look and a nod by the QB.
Finally but not least is catching the darn ball.
I hope Adams is good enough to be the #3 receiver. Good for him. Good for GB and good for the fans. If not, if he needs time to develop, no worries as Boykin has already demonstrated that he has made the transition to a solid NFL WR.