DC's Grand Prix is one of the most overrated accomplishments on Sherdog. He won a tourney at that point consisting of only of Bigfoot, Sergey, and Barnett lol. He entered after Overeem, Fedor, Werdum, Arlovski, Rogers had already willfully bowed out or been eliminated.
It's still good to have beat Bigfoot and Barnett, but don't act like he actually won that tourney from start to finish. The best fighter in it had willfully left to go to the UFC and that's the only reason DC got to be in it, and because Overeem had made it into the semis DC got to slide into that spot off Overeem's coattails.