CHICAGO — R. Kelly’s former business manager and current co-defendant took the stand again Thursday for what promises to be lengthy testimony in his own defense. Derrel McDavid, who began testifying late Wednesday morning, said again Thursday that in the early 2000s he had no reason to believe any of the claims about a tape showing Kelly sexually abusing his underage goddaughter. In February 2002, McDavid said he heard about two phone calls in the same day: One from Kelly’s ex-manager Barry Hankerson claiming he had a tape of Kelly and his goddaughter “Jane” in a threesome, and one from Sun-Ti…