Neither Wroten or Wright is the kind of big, run stuffing DT the Bills need. In terms of DTs, I'd much rather see us go after Gabe Watson later on if we're not going to go after Ngata.
It's hard for me to believe a guy as strong as Ferguson is w/ his kind of athleticism, and one who plays against top competition regularly (ACC, as opposed to someone from a weaker conference who is earning rave reviews) is going to be a bust. It could happen, but I don't think it will. For lineman, especially ones who end up on bad teams, it's always tough to gauge them early on. For example, since New Orleans is having such a crappy year, the tendency is to think Jammal Brown is not having a good year. If you watch the Saints play, and I have on a few occasions (including the time I went to the Bills-Saints game this year), you'd see that Brown is more than likely the best offensive lineman the Saints have and is doing a solid job as a rookie.