TJ was MORE THAN DESERVING at flyweight, seeing as Mighty Duck had cleaned out his division and had no viable challengers left.
So, yeah, a guy can make the weight that you're the champion in, and you don't want to fight him? That is ducking. I personally don't give a flying fuck if DJ or his twelve fans didn't think TJ deserved it. The UFC did. The majority of the fans did. Want to know why the fight wasn't made? DJ. Him, and him alone. Not his management, not his team, not TJ, not the UFC. Him.
Cejudo took Mighty Duck's belt, and then not three minutes later, stated his intentions to do what Mighty Duck tried to avoid doing like the plague. That's the definition of balls.