It disturbs me when people respond to posts in a condescending manner. I generally consider MMA fighters Judoka if that's their primary grappling background, and if they actively use Judo in the cage. Karo, Akiyama, Rousey, these are MMA Judoka. Guys who wrestled for 20 years and picked up a few Judo throws are not Judo based fighters. Guys who are primarily catch wrestlers but did Judo at various points in time (this applies mostly to Japanese fighters) I don't consider to be Judo based MMA fighters. And my point, if you go back and actually read what I wrote, is not that there aren't any but that they've never been champions. Hector Lombard doesn't count until he manages to do something in the UFC. Here's the complete list of UFC titleholders since the inception of the organization:
List of UFC champions - Wikipedia, the free encyclopedia
Show me all the Judo guys you apparently see. Because as much as I love Judo and have practiced it and given thousands of hours on the mat and think it's a great martial art, I don't see any.
And just for good measure:
List of Pride Fighting Championships champions - Wikipedia, the free encyclopedia
Other than arguably Fedor, there aren't any Judo based champs here either.