When Cody Brundage steps into the Octagon on Saturday, he’ll carry his daughter’s fight with him. Brundage, one of four locals on the UFC Fight Night card in the promotion’s return to Denver at Ball Arena, has gained strength from watching 3-year-old Kingsley battle ALG13-CDG — a rare disease caused by a genetic mutation. “This (fighting) life is pretty hard in terms of balance because it demands everything of you, and a lot of times it doesn’t really give that much back,” Brundage said.