The #1 need is obviously a QB at this point. They just won't be drafting one. But, it's definitely need number one.
O-line. They may ride this Bruce Campbell at RG thing for a year or two, but I can't imagine him being the answer there. Center is obviously a point of concern. RT is okay, provided Walker re-signs. Depth at tackle is non-existent, though. Depth at guard is weak. There isn't even a backup center on the roster. An O-line heavy draft would not only make sense but please just about everyone.
WR is pretty bad. Doesn't make any sense to add another rookie to the group unless he's on that Dez Bryant/Mike Williams (Bucs) level. An immediate contributor or nothing at all should be the mindset here.
CB is always a concern for such a man heavy defense. Nnam may walk after the season, and Chris Johnson is not that good. Ware and McFadden should in no way be counted on to start any time soon.
Weakside LB is aptly named in Oakland. Weak position here. Their best WILL is their backup SS.
FB: Reece is a good player, but he's not going to do you any good in short yardage.
A pass rush specialist DE wouldn't hurt. Scott's ACL tear could derail him for quite a while, and he wasn't exactly setting the league on fire this season anyway. Quentin Groves will get a look here, but I don't expect much.
A developmental DT would be a smart play. Remains to be seen whether or not Seymour walks or not. If he does, DT jumps into the top 3...unless they kick Houston inside, which would in turn move DE into the top 3.
Oakland's defense has "Third Downs Syndrome." Draft accordingly.
No offense, but your Raiders draft sucks.