Sure there might not appear to be much difference in talent between WR's available at 29 and 39, but the reality is that some will be good and some will be total busts. At some point you have to put faith in your scouting to make the right choice and not let fate decide who will be available.
I prefer to draft offense because this team is still a few years away. Offensive players take longer to develop. They can load up the D next year and get immediate contributions when it really matters.
I'd look for a boom-or-bust type pass rusher later in the draft, like a Brian Johnston or Tommy Blake.
I'm not sold on Groves. He's lucky this draft is thin on 3-4 OLB types, most years he would not be considered in the first IMO.
Something like:
1. Malcolm Kelly, WR
2. Carl Nicks, OT
3. Chilo Rachal, OG
4. Brian Johnston, DE/OLB