It is clear now that Pride never intended to work with the UFC, but to strictly compete with them. They used the possibility of a Chuck/Silva fight.
They wanted to face Silva in front of Liddell, right in the middle of the octagon, so that the UFC fans who may not know Silva, would recognize him as somebody from another organization worthy enough to fight Liddell for the title right away. Now Silva's name and face are on everyone's mind.
The press conference helped to seal the deal that Pride is superior to UFC. They mentioned that Tim Sylvia didn't have the balls to step up to Fedor. They asked all the fighters with UFC/Pride experience to explain the differences. All of them prefer Pride, of course.
Pride toyed with the UFC, then used their cunning business tactics to hit the UFC so fast, Dana White never saw this plan coming.