I agree. They havn't proven themselves. Koren didn't play much at WR last season, and he has to earn his respect in the league.
I dont think any of our recievers have proven anything yet. K-rob made the probowl not as a reciever, but as a special teams player. No one has proven anything yet, until that happens our recievers are below average and he has a valid point. Now if one or more of our WR has a better year than chambers, then pep can put his foot in his mouth, but until then he has a point.