I assert that everyone in MMA can be connected to Travis Fulton in less than six steps.
I thought this would be trickier than it was but with his fights with Jeremy Horn and Dan Severn it is not so tricky.
I use Sherdog's Fight Finder as a reference.
Travis Fulton to Rickson Gracie
Fulton fought Severn who fought Royce who fought Takada who fought Rickson.
I am sure there are some one hit wonders out there who you could not conect but even...
Ranger Stott fought Mark Kerr who fought Heath Herring who fought Fulton
I think using some of the lighter weights would make this harder but... who knows.