Justin Harrell definitely has the highest "NFL grade". He could possibly be a first round pick and if gets that high of a grade, I don't see him returning.
Brent Hubbs says that he feels that both Aaron Sears and Rob Smith WANT to leave early but he isn't sure if they will grade out high enough to justify them leaving early. Rob Smith would go undrafted, imo. At best he would be a VERY late pick. Sears would not go until the second day, in my opinion.
I think those two will be back simply because they want be a high priority for NFL teams.