Man you guys are throwing around "possession receiver" like some sort of slur. That's what smitty was for the second half of his career. That's what Brandon Marshall has always been; fitz, boldin, dez, too. Garrett's movement reminds me a little of Marshall and Owens (a little slower than T.O). There have been plenty HOF WRs that run 4.5 or worse so lack of blazing speed isn't so worrisome, to me. If he can polish off his routes, he becomes and upgrade over Philly as WR#4 - similar speed, ability to get open on and catch the deep ball despite mediocre speed, taller, bigger.
If that is the case, then the question becomes do you want Philly, Byrd or Hill as WR#5? I personally keep Philly or Byrd. Byrd if you want speed. Philly if you want continuity on offense, route running, and very high floor. Byrd is a question mark. Hill has a high ceiling but and equally low floor. Oddly, though, in the scenario I just described, where KG upgrades over Philly, its possible that could take Philly completely out of the equation and actually make room for Byrd or Hill because of their speed.
I'm all for whichever WRs can prove they can play. I think Hill has been proving the exact opposite. I know you can't teach size and speed; but what you can teach and improve upon is catching the ball and running routes.... in the league long enough to be considered a veteran and we haven't seen Hill do either.