Obviously, opposition strength is an extremely important characteristic in determining who becomes a top-ranked fighter and who holds onto their high ranking in times of bad performances.
Here is the Top 10 list for fighters with the best opposition strength since 1/1/2007. The ratings were normalized by division and a minimum of 3 fights is required for listing.
1> Dan Henderson (161.8)
2> Forrest Griffin (126.6)
3> Yasuhiro Urushitani (122.7)
4> Jens Pulver (120.8)
5> Quinton Jackson (120.7)
6> Mamoru Yamaguchi (112.1)
7> Wanderlei Silva (108.9)
8> Matt Hughes (105.9)
9> Georges St. Pierre (104.1)
10> Gabriel Gonzaga (102.8)