The UFC seems to take a "we don't do freak fights" stand every now and then (even though they do freak fights), and usually it's a few specific guys that bear the brunt of this, in order for the UFC to project its legitimacy.
Kimbo getting cut at the first opportunity.
Green Ranger never getting considered.
Lashley never getting considered.
James Thompson never getting considered.
They'll sign CM Punk and Toney, but then they need to demonstrate that freak fights aren't really their thing. But instead of a clear policy, it's more like "this freak is okay but this freak isn't."