‘It was not a pleasant development that Bosa injured his calf during the OTAs and has been sidelined the bulk of the spring. He has been in the NFL nine seasons, all with the Chargers, and in only three did he play in 16 games. Bosa, who will be 31 when training camp begins, has missed 23 games over the previous three seasons, and it seems like his health problems have followed him to the other side of country.’