Don't know who they'll keep at this point because the coaches sure do see it differently than I do when it comes to a player or three. Regardless, purely as a fan here's how I rank them, personally:
Nelson - An NFL top 10 receiver for sure, and possibly a top 5 (when he was younger and healthier). He may still be an outstanding talent as a WR. His health may turn out to be his limiting factor. Maybe he's got some Larry Fitzgerald left in him. I sure hope so. I'll miss his crew-cut someday.
Cobb - Not a top 10 NFL receiver except maybe for the number of drops he had last season. Needs a healthy Nelson to complement his game. The #2 in a one-two punch that must also include Nelson, apparently. Frankly, I would like to see him play some more coming out of the backfield, especially if the other WRs are healthy. Now that's a match-up problem and change of pace all in one.
Jones - A proven #3 receiver and capable of rising to #1 if needed, at least to a point he can prevail against some competitors but not against the top DBs in the game. Nobody expects that of him. However, he did more than what was expected of either Cobb and especially Adams this past season, and then some. Does much better when facing the #3 DB on the opposing team but, hey, who doesn't? Earned a shot to make the roster next season and deservedly so. Less worried about his age than his speed.
Janis - Big, fast, strong. Played well in the clutch when other youngsters have not -- at least not like Janis performed when the opportunity came-a-knocking. Shows plenty of upside if you're really looking for it. Inferior college competition made him less NFL ready so he desperately needs game experience -- something that MM and his ******* Jack 2015 WR coach have been averse to giving him. The latter two had worse seasons than Janis did (See: Packers 2014 offense vs. Packers 2015 offense), so take their opinions with a grain of salt. It's got to irk them when sportswriters and some fans might have a point and a player's good performance leaves them with egg on their faces.
Montgomery - Looks were deceiving. Built like Tarzan except that he got Jane's ankles. Really too bad he got injured because he was off to a very nice start. Big, strong, but not particularly fast. He's kind of like James Jones when he came into the league, and that's pretty good. I'm intrigued by him playing as an occasional RB, same as Cobb. Also has upside if you're really looking for it.
Abbrederis - Knows how to run a pass route and can actually get separation. Does not run to the DB and then stop. That gives him a big leg-up on some other guy. A football player, though possibly a fragile one. If he can stay healthy he can be a reliable threat coming off the bench. If, if, if...
Adams - Slow, semi-quick, no appreciable YAC, and hands that have huge holes in them. Otherwise, he's got upside dunking a basketball -- something rarely required in an NFL game. He was taken high in the draft, so he's got that affiliated hype going for him. So had Kyree Thornton, Jerel Worthy, Derek Sherrod, and Justin Harrell before him. Just sayin'. McGinn quoted one scout during the season as saying that his Grandmother could cover Adams. I hope she signs with the Packers so Adams won't have to worry about playing against her. Also has upside if you're on your 12th beer and you really squint your eyes. Nowhere to go but up...or out.