AOL's human "computer," Ron Grant, is building an elite team of high-tech ubermenschen to lead the Dulles-based online service back to technological dominance. Or maybe not. Former CNet employees are snickering over Grant's choice to head AOL's platforms division, the weightlifting, Corvette-driving, cat-loving Ted Cahall. According to one former CNet staffer, Cahall left such a miasma of bad feeling that the exodus continues a full year after he left the San Francisco tech publisher.