An injury during sparring forced  Dan Hooker out of the UFC 313 co-main event. Hooker (24-12) was scheduled to No. 3 ranked  Justin Gaethje (25-5) in the UFC 313 co-main event on March 8 at T-Mobile Arena in Las Vegas but was forced out of the fight due to injury.  During an appearance on  Sky Sport New Zealand , Hooker opened up about the injury and having to back out of the biggest fight of his career.   “One of the paws is not doing too well,” Hooker said. “I was sparring last night, just as I do, just letting some hooks go, just throwing some bombs down range, and I just caught one of the boys on the top of the dome with my knuckle