Yes it's preseason and should be taken as a try out or evaluation for every player like DG say. If Brown is being evaluated then their are others that has out preformed him (Boykin). If DG really evaluate players like he did Smith, then there isn't any reason Brown ass should be starting.
Being undrafted don't have a damn thing to do with anything. On the NFL level there isn't any excuses. You get paid to perform and if you don't your ass should be cut. That's what's wrong with the organization. Accepting mediocrity