Chargers first-round draft pick Antoine Cason remained unsigned Sunday night and didn't sound optimistic he'd be at the first practice of training camp. "I'm not sure. It doesn't look like it as of now," Cason said by phone. "I don't know." "I mean, we're we were making progress, of course," said Cason, a cornerback from Arizona who went to the Chargers with the 27th overall pick.