I think you're referring to the Rivals rating, which in most cases is a popularity contest. Scout (ESPN) ranks Okafor as a 4-star, which I think is accurate.
We are not settling. TCU, the team that blasted us a few weeks ago, was the favorite to land Okafor for most of the summer.
I know the kid personally so it might seem I am biased, but as honest as I can be I'd say Denzel is one of the top 3 OL in the DFW Metroplex. Additionally, Okafor has been a starter for three straight years at a 6A high school that is in a district with Allen, FM Marcus, the Plano schools and McKinney Boyd. He's a proven commodity.
Outside of ALL OF THAT, I would suggest to you that a UT staff with the likes of Strong, Bedford, etc., are not dependent on Rivals or any other rating service to conduct their recruiting. They know what they see when they see it. It's why so many are left perplexed when we don't go after some 5-star and instead are in pursuit of a 3-star. I honestly trust this staff (and others around the league) much more than I'll ever trust a service that involves the likes of Jabba the Hut to make it's ratings. That guy never touched a football field in his life.