This is most pressing issue. The Raiders should look into bringing in Flozel Adams. Although he is up there in age, he would offer a lot of experience to the offensive line. The Raiders need to draft a lineman in the first round.
If Russell Okung is available at pick No. 8, the Raiders should draft him. If he's not, then Davis should trade down and pick up another second or third round pick. Bruce Campbell, who is freakishly fast and strong is a strong possibility with this pick and he would be able to learn from Flozel Adams.
Roberty Gallery is a great guard who had injury problems last year. Mario Henderson is a very good RT and should stay at RT. Chris Morrison showed some skill at the guard position, but Samson Satele, Cooper Carlise and Erik Pears have never really shown any flashes of brilliance.
The Raiders should pick up more offensive lineman with those additional picks Davis would get from trading down. They should also pick up Vladamir Ducasse who was a good OT tackle at the University of Massachusets. He is more suited for the guard position in the NFL given the length of his arms.
Other options are John Jerry, the massive guard from Ole Miss, and Mitch Pertus, who had 45 reps in the bench press at the combine. Marshall Newhouse has all the intangibles to be a good guard in the NFL. Mathew Tennant was a very good center at Boston College and should fall to the third or fourth round.