A I rank and Exp

My problem is how do AI get up the ranks after they get to 1st dan my guy has had 20 fights since becoming 1st dan and has a sign in the top left corner that says champion,but has not had a single rank fight he wins about 75,85% of fights how can i get him to get a better rank .also why does exp stop when u get to dan rank.Any help pls thx.
PADDY

 

<a target="_blank" href=http://virtuafighter.com/view.php?section=vf4&file=vf4_ranking_faq.html>http://virtuafighter.com/view.php?section=vf4&file=vf4_ranking_faq.html</a>

 

Thnx 4 yr help m8.

PADDY31