No prob. These are not personal assessments, or the assessments of any one person out there.
I am using the bracket matrix website for where the teams are seeded: It's a consolidation of all the brackets that are out there.
http://www.bracketmatrix.com/
The last 4 in, would the the last 4 of the 32 at large bids in the tournament. If you look at the bracket matrix they can be identified as the last 4 teams that are not bolded (look at the 11/12 line). Not every person that is doing the bracket has them in, but they are getting more at large bids than then next group.
The last 4 out (or last 8 out).. They are at the bottom of the matrix. Some people have them in, but the majority do not.