The last km were hectic. Trains changing directions all the time. (It's a sprint finish but still...)
When you get the see the footage from the front camera. It seems like Greipel, Plus, the trajectory and behaviour of the lotto rider that sweeps to the right makes sense with his report on the sprint finish. Respect.
Re: Petacchi. Like Gorilla said, "Just keep the line". It doesn't matter to me whether he couldn't see them or not. He knows he has riders behind him and going from left to right that way it's dangerous riding, IMO.