Man we have to recruit athletes that have natural god given ability to catch. Just like a shortstop, you can't turn an outfielder into a shortstop. It's hard to catch from a lefty the ball spins backwards but there is no excuse for WR dropping balls. Everyone thinks speed is the most important factor in a WR recruit it is not, it is the ability to catch any ball, any angle, any speed, while running.
Gronk and Hernandez were the most successful tandem in the NFL at one time and they both ran 4.7 40's.