"I'm not (elaborating) about it," Jacobs said Tuesday, according to The San Francisco Chronicle. "It seems like every time I do, I get destroyed in the media. So I'm not going to say anything about it. Every day, I work hard. And that's that.
"That's all I can do, right?"
A frustrated Jacobs has deferred all questions to the coach.
"You want to know anything about that, you've got to talk to him," Jacobs said. "You guys can go talk to Coach Harbaugh. He can tell you whatever you want to know. I work every day. That's the answer I'm going with. You have to ask Coach Harbaugh for anything else that you want to know.
"I feel really good right now. That's about all I can elaborate on. I've been saying that for a while."
You'd think a 264-pounder could at least help in short-yardage situations, but the 49ers are 6-2 and, arguably, the best team in the NFL. It takes some big stones to question who Harbaugh selects to the 45-man active list.