Colston article from cbssportsline.com (LINK)

There was obviously a hole in this kid or else somebody else would have taken him and there wouldn't have been talk about signing him as a free agent had he remained undrafted. Now, I'm still looking for the hole because I don't see it. Maybe they were worried about his transition between TE and WR? Or maybe he was dropping a lot of lot of balls. What good does having a prototype do if the prototype can't catch the ball.