San Francisco 49ers WR Dante Pettis has impressed QB Jimmy Garoppolo and head Kyle Shanahan with his new physique and attention to detail. ‘Dante’s body is maturing,’ Garoppolo said. ‘He’s coming out of breaks with power, he has speed.”He worked while he was away,’ Shanahan said. ‘He tried to get bigger. He worked more at his routes and he came here with the idea of ‘Hey, I’m not just coming here to get better back in shape, I’m coming here to get better.”