Woodson won't want to play safety for at least a couple more years when he finally feels as if he is losing a step. It's obvious he can still play corner, and the only reason he played free safety in Oakland was because their entire secondary was asswater, and having Wood as the last line of defense was the best option they had.
Leon Hall is a great corner, but it's painfully obvious the Pack needs a safety STAT. Landry from LSU brings the FUNK and just flat out makes plays. Nelson is a converted corner who could have the flexibility to interchange with Woodson once that scenario arises and depending on the scheme, but I'd rather have an intimidator like Landry back there.
I will also say that I agree with those who think AD can't be passed on...that kid is unbelievable, but I don't know if he'll fall that far.