I like events which have the possibility to cause chaos. UFC 98 is definitely one of them. The first chaos fight is Yushin Okami vs Dan Miller. Okami is the last guy the UFC wants to fight Middleweight Champion Anderson Silva. They have claimed he was in line for a title shot a thousand times, but that's publicly. Privately they are praying he loses to someone, or at least looks mediocre in a win. If he beats Miller, and he probably will, it will put him a fight away from a title shot. At that point, I expect the UFC to panic and throw Demian Maia at Okami in a last ditch attempt to derail his title hopes. Actually, Maia/Okami would interest me a lot more than Maia vs anyone not named Anderson Silva.
The other chaos fight is Lesnar vs Mir. You could either have Mir vs Couture/Nogueira or Lesnar vs Couture/Nogueira. Which do you think sells more PPVs? If the UFC would have packed the first bout between Lesnar and Couture with a better undercard, it might have done 1.5 million buys. A rematch with Couture coming off a win over Nogueira would be enormous. It would also be within reason to schedule it for December or January, both are known to be the UFC's biggest PPV months. Imagine a card like UFC 92 with Lesnar/Couture II headlining. If Dana White is reading, he just got up to change his pants.
Of course this all hinges on Lesnar defeating Mir, which he failed to do in the first fight. When you watch Mir/Lesnar II, you're actually watching the UFC lay tens of millions of dollars on the line. Mir can change their entire 2009 financial outlook with one arm bar. I'd never be able to run the UFC because I'd probably hit Mir over the head with a steel chair if he tapped Lesnar again. I believe any situation can be remedied with the aid of a foreign object to the head.
(Did Pro Wrestling create the term "foreign object"? I've never heard it anywhere else, although it's kind of a difficult thing to work into everyday conversation, "Oh no!! Darren just pulled a 'foreign object' out of his pants. Wait...sorry. It's just a cell phone." Someone needs to write a thesis on this, I swear.)