I can tell you haven't watched him closely at all. Or any wide receivers for that matter. Read my breakdown when I post it, maybe it'll enlighten you and some others.
I watch, and re-watch all Panther games, Philly is nothing special, or worth a roster spot. If we had kept LaFell, Hixon, and Smith he wouldn't have made the team. Hell Underwood was supposed to beat him out but he had a terrible camp. Philly, small, got hurt a few times, not particularly a field stretcher in the same category as Ginn is, can't return punts or kicks.
What does Philly do so well, give us a snippet of this expert break down. Brown made the team out of necessity straight up.