The Cardinals and Mariners top the list and the Rangers rate 4th, as I believe all did in Jim Callis's personal rankings. He describes the system as 'rapidly improving' and points to the emergence of the Latin positon players (Hanson and Polanco, etc) as well increased potential back end of the rotation depth. He does acknowledge the lack of success with overslot high school arms (to this point). That aside the positive developments result in an ascension from their ranking of 12th last year.