From a football stance this kid would be absolutely stupid to decommit. Like I have said in the past, If you are a defensive back and you don't go play for someone named Pelini or Saban given the chance you are an idiot. Going to play at Arkansas would be like going to Mizzou to play DB.
Rivals did a study a year (or two?) ago that surveyed a bunch of recruits, and the most common reason for signing with a school was proximity to home. There's more to the recruiting process that who had the best defensive backfield in the last year.
This was a list of why kids pick certain schools
• Whether the athlete made an “official visit” to a specific college
• Whether the school is in a BCS conference
• The distance from the high school athlete’s hometown to a specific school
• Whether the recruit is in the same state as a specific school
• The final AP Ranking of a specific school in the previous year of competition
• The number of conference titles a school has recorded in recent years
• Whether the school is currently under a “bowl ban” for violating NCAA rules
• The current number of scholarship reductions a school faces for violating NCAA rules
• The size of the team’s stadium (measured in terms of seating capacity)
• Whether the school has an on-campus stadium
• The current age of the team’s stadium