LAS VEGAS – As UFC featherweight Cub Swanson nears 15 years competing at MMA’s highest stage, the 38-year-old veteran believes his track record stands as testament to his worth. “I think the longevity really shows your professionalism because, man, I can’t tell you how many people have been the next big thing and, like, I’ve been here,” Swanson told MMA Junkie at Wednesday’s media day at the UFC Apex. “This person is the next big thing, and they come, and they have these big fights, and then they’re retired and people don’t even remember them anymore – and I’m still here. To me, that’s impressive. Try being, top 10, top 15, for over a decade. Try doing that