Sorry, the numbers just don't work out that way. If you seed your teams in the order of their top 25 ranking, the 25th rated team is going to have to settle for a 7 seed:
1-4 = 1
5-8 = 2
9-12 = 3
13-16 = 4
17-20 = 5
21-24 = 6
25 = 7
Stop your logic and reasoning on CF right now!!!!! The internet has no place for that!!!!!