Should all 4 draft picks be used for Defense?

[Oakland Red]

I would draft the most talented player available, with only secondary consideration to need. Otherwise you end up like the Texans drafting Mario Williams when you could have had Reggie Bush. The Saints already had McAllister but they were smart enough to draft Bush anyway. If the most talented player available is not at a position you have any interest in getting help at, you can trade the pick at the best moment to someone willing to give the best deal.

With everything else being equal, we do need offensive line depth, defensive line help, and linebacker help. Corner I would address by signing the Buffalo free agent if we can, and safety I would really address by trying to get Ryan Clark back, to give us a fine player who fits in very well and is a real asset for Sean Taylor.