Alabama was worried that Smitty was too light when they were recruiting him. He weighed 159 at one of the last camps that Saban saw him. After analyzing how exceptional his hands, fluidity, and route running were - Alabama made him a priority.
He won a national championship with a walk-off homerun as a true freshman, and left college football as the most decorated WR to ever play the game - and in his wake a trail of bodies made up of the best cornerbacks you can put on the field. All either already in the NFL or will be soon.
Whatever team continues to make him a priority probably won't be disappointed. He's been this guy since high school. It doesn't matter who you line up across from him they can't stop him. Some players are just special.