Again, watch the entire presser - he went into much more detail.
From here: http://www.sportsxchange.com/tsxfiles/?page_id=211&max_colums=20&story_id=86355
"Ribs are a funny thing. They really are," Marrone said. "You can practice the next day sometimes. You can come back into a game. Sometimes on the x-ray it shows that it's a crack. Sometimes it shows that it's not and then you take a better x-ray and there is a crack. Sometimes, depending on the player, you can be out two weeks, four weeks, six weeks or two months. I'm not going to get into that stuff this year."
"I'll be ready to practice without him. When he comes back he will be ready to go," Marrone said. "I don't think one person is going to make or break. We have to continue to move on. I'm excited about the guys we will have out there. He's not out there, and when he comes back, I don't know."
He's really being a jerk!