Robert Saleh, the former and future defensive coordinator of the 49ers, held his first defensive meeting and there were linebacker Fred Warner, defensive end Nick Bosa, defensive lineman Kevin Givens and defensive end Alex Barrett, assuming they all were there for a voluntary session heavy on conditioning and physical rehab.

After watching several starters leave for other teams at the start of the free agent period, the San Francisco 49ers had some glaring holes on their defensive depth chart.