Raiders Draft: Top needs after Week 1 of free agency

So, what are the Raiders’ draft needs now and which ones are the most pressing? Offensive Line Currently under contract: Kolton Miller (LT), John Simpson (LG), Andre James (C), Alex Leatherwood (RG/RT), Denzelle Good (RG/RT), Jackson Barton (OT), William Sweet (OT), Alex Bars (OT/OG), Brett Heggie (C), Hronis Grassu (C), Jordan Simmons (OG), Lester Cotton (OG), Jordan Meredith (OG) I was surprised that the Raiders didn’t make at least one significant signing for their offensive line this week.
http://dlvr.it/SM13Cr