Seems from where?
We aren't so much looking for DT's or 3-4 DE's but NT's. Run stoppers who can plug the middle. We have Traylor and perhaps Zgonina, both of whom have a lot of miles on them, and the young guys, Manny Wright (just switched inside), Fred Evans, Steve Fafita, and perhaps Kevin Vickerson. Too much age or too little experiance is the issue.
JT switching to the left side of the defense? Yes he did that some last season but he has been generally on the right side of the defense, backed by David Bowens and now also, if another thread is to be believed, Ben Ishola. Roth was backing up Kevin Carter who played LDE in both the 4-3 and the 3-4 formations. Roth would play the same way.
Where have you heard that has changed? Is there a link?