Nick Bosa wasn’t the first or only 49ers headliner to solemnly shoulder the blame on Sunday afternoon, but he might’ve been the clearest and most earnest about it.



“I know I let all of them down,” Bosa said, referring to his teammates after the 49ers’ clunky and somewhat shocking 29-22 loss to the Falcons at Levi’s Stadium.



Why do you think that, Nick?



“‘Cause I didn’t win my rushes, I did the wrong things on a couple plays,” Bosa said. “I just need to be more of an impact player.”



George Kittle wasn’t the first or only 49ers star who was obviously seething after this loss — which dropped the 49ers to 11-3 on the season a week after their rampaging 48-46 victory at New Orleans.



But Kittle, who did not spare himself for Sunday’s crucial fourth-quarter fumble on a third-down catch that prevented him from making a first down that could’ve sealed the...