Often times someone will leak information before Dana has a chance to day anything. For instance, someone at Brock's camp probably said something to the press before Dana wanted it spilled. Samething with Rich, as his fight with Vitor was a rumor at first.
He's right. It takes time to formalize agreements and get contracts down. In this case the press is quick to jump on it even if it may be unsubstantiated rumours. How many times have the media got it wrong then quickly corrected themselves. The UFC isn't going to release anything unless they are 100% otherwise they'll look unprofessional. These days the press are quick though which is good for us fans because sometimes we're able to hear what's going on.
Scenario: Someone in camp leaks the news about Brock.
UFC: They hear about it, but want to talk to Brock directly to confirm it. Usually 24 hours pass before anything is verified. Why, because they want to confirm it and secondly figure out what to do with their main card while they got hundreds of other things to worry about.
Not having that card completely screws up the line-up so A. they can completely cancel the card which is unlikely so B they'll have to bump up the co main event or replace it.
The UFC just makes it look ridiculously easy. Remember Affliction. They were in a "similar" situation and went out of business, same goes to Elite. UFC simply rolls over it with ease.
Without a doubt Brock needs more time to train. Rashad vs Thiago Silva would be a good co-main event. Tito has to be relishing in this now.