This is interesting. I'm guessing Brown would love to be a Bill. And I'm sure he knows he's not going high in the draft so he's not going to be making gobs of money (relatively speaking), so if the Bills like him, it would behoove them to tell Brown to run slow at all his workouts, and that they'll take him in the 3rd round.
And if he projects as a "solid #2 WR" and the Bills can get him in the 3rd and, he should be a good #3 WR and develop into a #2 behind Evans.
Hey, it's a nice fantasy, assuming the kid has some goods and will want to play hard for his favorite team.