Alex Boone, a 49ers offensive lineman who played for Harbaugh during his four seasons with the 49ers, said during the feature that Harbaugh wore down his players in San Francisco and management was fed up.
He said Harbaugh, who had success in previous college rebuild jobs at San Diego and Stanford, does a great job of initially bringing what he called a spark.
"But after a while, you just want to kick his (butt)," Boone said. "He just keeps pushing you and you're like, 'Dude, we got over the mountain. Stop. Let go.' He kind of wore out his welcome."
Kremer asked what that means.
"I think he pushed guys too far," Boone said. "He demanded too much, expected too much. And you'd be like, 'This guy might be clinically insane. He might be crazy.'"