It should go with out saying guys like David Johnson, Todd Gurley and John Brown should be scooped up right out the gate of your free agency period.  

Outside of the obvious, I break down the top-five waiver wire adds for Week 5. 

It might have taken all four weeks but one of the most electric running backs from an all-star class busted out of his shell Sunday. Cleveland Browns running back Duke Johnson tallied up 116 all purpose yards and caught a dazziling 34-yard touchdown pass while tip toeing in the corner of the end zone. 

While he will likely continue to share touches with Isaiah Crowell, the coaching staff can't ignore Johnson's production and will be forced to increase his playing time while getting him more involved in the run and pass game.  

After spending time in Mankato for Vikings training camp it was clear from the get go the front office got a steal in fifth-round pick Stefon Diggs. The wide receiver from Maryland subbed in for an injured Charles Johnson and caught six of his 10 targets for 77 yards.  

While the numbers were impressive, it was the fashion in which Diggs went about his buisness making tough contested catches over the best cornerback tanduem in the NFL look effortless.  Certainly,Mike Wallace is the team's number one option in the passing game, however, Diggs may have just leap frogged guys like Cordarrelle Patterson and Jarius Wright in one fell swoop. 

Check out the rest of fantasy free agents that are well worth the price.