Which WR is going to step up?

With Deion Branch certain to miss at least four games and Hackett leaving for Carolina, we seem really weak at wideout. With Burleson and Engram the only experienced WRs left on the roster of a team that likes 4 wideout spreads, we're bound to see a lot of  Ben Obamanu, Jordan Kent, Courtney Taylor and possibly Logan Payne. I was initially really bothered that we didn't take a WR like Steve Johnson with the sixth or seventh pick, focusing on a problem LS position instead. However, if Mike Holmgren thinks that the aforementioned young talent can make the step up then who am I to argue! That being said, who does everyone think is most likely to make an impact this year? Obamanu seems the obvious choice, as he's seen the most snaps. However, if Kent has developed into a solid route runner and consistent ball catcher, his mixture of size and blazing speed could be a huge asset.