They just can't allow SEC teams to fall.  Mississippi State lost twice last week, and is back at #11, courtesy of a two point win at home over 12-8 Tennessee.
Kentucky loses at home to unrated Vanderbilt and on the road to unrated Florida, and they only drop to #18.  
Missouri wins over two unrated teams and is up to #21
Tennessee loses twice before clobbering unrated Alabama, and is still in the top 25 at #23 with a 13-8 record.  
At least, OU conquests of West Virginia and Washington look better now that they have been and/or are rated.  BYU is finally getting votes.  Beating A&M just hasn't gotten them a lot of traction.