49ers’ Fred Warner ‘full throttle’ to open training camp, plus updates on Bosa, Kittle, Aiyuk

SANTA CLARA — The biggest questions that were expected to define the 49ers’ training camp played second fiddle to the health of their head coach on the team’s first day together. After addressing Kyle Shanahan’s status following a serious car crash that left him concussed and coaching only in limited capacity, general manager John Lynch...