Just because the media and Longhorn fans are hyping up ET doesn't mean he won't "fall" into the 20's. So far, there is nothing unrealistic about how this draft has gone.
If Charles Brown is the man GB wants, I don't think they risk losing him by trading down a few spots. I think Philly and Balt would like Thomas, but they have a greater need at CB. Yes, ET can cover like a corner, but I think they go with a Kareem Jackson or Devin McCourty here.
I'm thinking that this is the point where Dallas pulls the trigger and trades up to secure ET.