Here's who stood out on Day 17 of 49ers training camp. Keep in mind, second-year wide receiver Jacob Cowing did not practice.

49ers wide receiver Jacob Cowing did not practice Wednesday. Coach Kyle Shanahan said on KNBR that Cowing is dealing with the same lingering hamstring injury that sidelined him early in camp. “Yes, it is [the hamstring],” Shanahan said on the radio, via David Bonilla of 49erswebzone.com. “ He felt it yesterday, so we had to hold him back today.”

The 49ers wisely have some key veterans, most prominently Nick Bosa, Christian McCaffrey and Trent Williams, on schedules designed to keep them fresh and out of the fray from time to time. Quarterback Brock Purdy is a leader in a more reserved, analytical way. Deommodore Lenoir is stepping up to push the secondary.

"If the 49ers want to lighten Christian McCaffrey's workload, they must add a durable running back to the rotation," Moton wrote. "Robinson can grind out yards between the tackles, which would allow McCaffrey to stay fresh for the length of the regular season."

There's no clarity yet on which quarterback will start for the San Francisco 49ers in their final preseason game.

Rookie running back Corey Kiner has been waived by the San Francisco 49ers. Kiner, an undrafted free agent, has been one of the better performers for the 49ers in training camp. Unfortunately, he sustained an injury in the preseason game against the Las Vegas Raiders.