I get it. At the moment, the team needs someone to replace Welker for at least half the season. That role is slot receiver and Welker should play that role. We need someone else to be a #2 receiver, the long distance threat opposite Moss, the #1, the big TD threat. Both Moss and this new receiver should also be able to go over the middle, especially on intermediate routes. Edeleman as the #3 or slot receiver would have 5-10 catches a game.
We also need a #4 receiver as a change of pace, in spread formations (4 and 5 wides) and in case of injury. Edelman is the #4 when Welker comes back.
BOTTOM LINE
We need at least one receiver. Two or even three free agent receivers competing for two rosters spots with Stanback on the starting 53 would seem to be the ideal situation.